Can someone tell me how can I replace the spark plugs on Dodge Caravan 2005, from above?

Hate to tell you but most likely your timing chain either broke or slipped, it could be cam or crank or both sensor

Pull a spark plug wire and check for spark. Just take a spare, working spark plug and put it on a plug wire (or take a plug out of your engine), and ground the plug hex or the plug threads on a metal piece of the engine. Now the plug is grounded, so you won't get shocked when checking for spark. But just in case, wrap a heavy rag around the wire, or use a glove to hold it, and watch the spark jump the electrode while someone is cranking the engine. A good ignition system will have a blue, snapping spark. If you have no spark, check a second wire, and still nothing, then the ignition system needs checked-the coils, ignition module, and crank position sensor, and so on. An orange or yellowish spark is also a sign of ignition problems.
If you do have spark when checking, then check if fuel is reaching the engine-the schraeder valve on the fuel rail is the test port for a fuel pressure gauge. Really what you need is to check fuel pressure, but if you punch the center pin on the valve, and gas squirts out, then you know gas is up to the injectors and under some pressure.

The engine is in what is called a "limp in condition". Either have a dealer or auto zone scan the computer to see what is causing it, and have them erase the codes. If it does it again, you may have to have someone look at your ECM.

u need the proper size socket and ratchet remove them one by one at the same time replacing the spark-plug wire

It is most likely a miss-fire code in the computer causing the light to come on,and off,the plug boots,or a coil is the problem most likely,have the codes read,it will tell witch cylinder is the miss,and you can replace the coil and boot,this is the most likely problem.

If you have good fuel pressure. Check for spark at any plug while cranking, If no spark, also place a screw driver on an injector and listen to it while someone cranks it over. If you have NO spark and NO injector click - crank sensor needs to be replaced. 95%
other 5% hmmm wiring problem on / near crank or cam sensors, theft system active, dead pcm.......

2005 CARAVAN 3.3L.
Van misfires, code says coil three . change out with new a cam sensor , injector, wires , plugs and of coarse coil. What is left and why would the pcm just have a problem with # 3.
ps i checked the compression and all six cylinders have 165. lbs.

sounds like you mixed up 2 wires...check the firing order on the block

The spark plugs wont make the light come on,but you could of caused a misfire if you didnt put the wire back correcttly to the right ports on the coil.Sometimes the coils are marked for which cyl. they belong to.

there should be a sticker someone in the engine compartment with that information... or it will be on a sticker on the underside of the hood