How do I get this tool apart to clean it.

I expect the design of your new chainsaw will be similar to many small engined tools where owners often discover they need an extra hand.

Usually the throttle is opened (trigger pulled) and then the trigger lock is pressed and the trigger released. The lock will hold the throttle partway open; freeing both hands to hold the tool steady and pull the starter. The partway open throttle makes starting easier and once started, the engine will run fast aiding a quick warmup and less chance of dying or fading.
Once the engine has warmed enough so the choke can be disengaged, a quick squeeze of the trigger will allow the trigger lock to disengage...

When the trigger is pressed, the engine should kick up to increase speed and thus pressure. There is a problem with either gas flow or the air is blocked (new air filter?), so I would start by cleaning the carb and make sure the small gas port is open (run a pipe cleaner through it).

get some air tool oil and put it in the hose connection and manually turn the socket end by hand,the air vanes have frozen in place and can't hold the air in to operate the unit,make sure when you do this squeeze thge trigger to let the oil into the units barrel,then connect to an air supply and try it,you may need to help get it started by hand,then let it run and add some more air tool oil again to keep it lubed

Check your fuel filter in the fuel tank to make sure it is clean if it is then"
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor or follow the instrucitons you get with the carburetor kit.
If the mower/weedeater is over a year old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
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Simply the switch will need replacing and this can be obtained from the mfr or you can get it repaired at a local tool repair center. Get it replaced asap.

The bypass valve is sticking.

SOLUTION#1 If the attachment wont spray water, the white plastic nozzle tip may be clogged. Take the brush attachment off, remove the two screws from the gray retaining cover (BE CAREFUL THE WHITE TIP UNDER THE BLACK PLASTIC TRIGGER MECHANISM IS SPRING LOADED and WILL GO FLYING). The trigger mechanism can be taken apart by lifting the black part off (may have to slide it back slightly), remove the spring from the white plastic valve insert, then take a flat screw driver and carefully pry the two white pieces apart and blow out both ends. You may have to find a hair size piece of wire to push threw it to clear it. The whole process is really simple once you take it apart and see how it works. Putting it together is in reverse order. The white piece will only go in to the black part one way and with the spring on you need to push it through the hole and the trigger part hooks on, slide it back on to the hose, then while holding it all, and put the gray retaining cover back on. Sounds more difficult than it really is. If your not mechanically inclined take some pictures as your taking it apart to refer to.
Solution#2 If the nozzle and trigger are clear, with the trigger assembly off the hose, plug the hose into the shampooer and turn it on (if the hose inside the suction hose is clear you should start seeing water flowing out the hose. If not run a piece of wire through that hose to unclog it. If its still not flowing then the Pump on the unit needs to be replaced.
Solution #3Cost Around $20 with shipping online. Google your make and model, and upholstery attachemnt pump. Mine was called AP4561692 (43582018) PUMP ASSM, from http://www.appliancepartspros.com/. (there real good about the live chat and helping you find the part).There are Youtube videos on taking apart the shampooer, which is pretty easy. The one place that might give you problems after you get down to taking the pump off, there is only one screw holding but there is on the bottom side of the pump a black bump that clips in to the base of the shampooer and you need to stick a screw driver from the bottom up and pry the base one way and pull the pump the other to unhook it.

bissel pro heat x2 does not suction up the cleaning fluid

It may be necessary to remove air from
the system (“prime the pump”) so the
clean solution will flow to the tool properly. Follow
these steps:
1. Attach tool to hose and turn the deep
cleaner ON.
2. Put the tool on a hard surface or
against your hand to block off the suction.
3. Wait a few seconds (can take up to
15 seconds). Then squeeze the trigger
and begin cleaning.