Have no idea how to use it

Good question, tuners can be simple and some are complicated
a basic automatic guitar tuner you would not have to do anything to the settings, just tune normal on the E string then slowly down tune to D most tuners are a little sensitive, so go slow
and one thing I always do is go lower than the note I'm tuning to then tune up tell it's correct, strings seem to stay in tune better
Hope this helps ?
and if you have time check back on my profile
I will be doing some video tips this weekend
showing tuning, and some basic guitar repairs
thanks for your time

I would say about 150 dollars

put a battery in your guitar. It goes in the space at the bottom, usually where you connect your cable to your amp.
Then hold the guitar as you usually would.
Look for a little board with buttons on the side of the guitar to turn on the tuner: )

my on board tuner used to do that. I just tried to tune the guitar normally and it usually worked after a couple of seconds. The tuner needs sound to work - it won't work without you playing any notes :)

I recommend checking music stores in your area for that, it doesn't have to be any specific rating of impedence. Depending on brand, I see guitars with anything from 50 ohms to 250 ohms. This only allows a faster cutoff on volume than others. The most critical action is to have a smooth taper, meaning a straight volume rise or decline versus one that goes down slowly or quickly and suddenly cuts off. Most any guitar volume control from a music store will work just fine. In case I confused you, ohms is the rating of the control, the taper or smoothness is classed as A, B, or C. A is normally for volume controls and B is used mostly for tone controls. Knowing that should give you insight insight to the difference of the controls.

Go to Google and type in the serial number along with the word manual and you will locate it.

Pro's loop the cable through their belt or guitar strap to avoid cable pulling out or twisting and wearing the connector.

well. this may sound retarded but every guitar is the same google or youtube how to tune a guitar, also get yourself a guitar tuner there cheap and affordable

It probably has corrosion going to the battery pack, take it apart and get it resolder, at the batt

Hello endaya try www.digikey.com if you are using a 2amp buss fuse, its available, 117V is applicable to 220V, just follow the amp rating.