The battery located at the front bottom of the bike.
Remove TORX screws from the right side and bottom cover (as if riding)
Move the cover aside to locate the battery
Remove two slot screws holding the battery
Replace with original,or alarm type battery (use plastic ties to secure)
[URL=http://s1059.photobucket.com/user/2750709/media/Mobile%20Uploads/952BFE63-B54A-417D-9B5E-F7C2706326D7.jpg.html]http://i1059.photobucket.com/albums/t436/2750709/Mobile%20Uploads/952BFE63-B54A-417D-9B5E-F7C2706326D7.jpg[/IMG][/URL]
Looking up your bike it does not appear to be outside of the design of a run of the mill bike.
Baisc steps
1. Release the back brakes which opens the brakes up os the tire can fit through, flip the bike over
2. Loosen the axial nuts, usually 15 mm
3. The tire should be able to slide forward a little
4. Now grab the derailer and stretch it to add slack yo the chain and get it out of the gear cob's way
5. Push the wheel forward to clear the two tabs
6. Lift wheel from bike.
Or take the bike to a bike shop and pay then to get dirty and greasy
https://m.youtube.com/watch?v=hdjB_wHW0-Q
I am assuming the bike is like most bikes in terms of handle bars.
there should be a bolt on the top of the up tube of the handle bars.
it can be a hex key head or a bolt.
https://m.youtube.com/watch?v=ZK5u5ioZU8M
Now the cog is an expansion nut, and as you tighten the bolt the cog gets jammed against the inside of the fork tube to hold the handle bar in place.
'this bike'? The one that only you know that you have :>D
Google
make model tyres
It will find details in your country. If you want to narrow it down further, add your city at the end. Or you can put a make and size into Amazon. If you have the bike, the size is on the side wall.
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If you shop around there are plenty of styles of handlebar. Might be worth you trying a bar from a dirt bike or some sort of cruiser bike. Another option could be to tilt your existing bars back a small amount and add a fork stem riser. Sometimes simply raising the handlebar height on the fork top can help.
I can't find a manual, but the install is pretty basic. You need to bolt it to the frame, then remove one of the sprockets on the derailleur to get the chain through, then replace. Attach the cable through the locking nut, using the lowest gear first, then run it to the highest gear to make sure it runs through them all. There are some set screws to set so that the derailleur doesn't go past the upper/lower gears. It's all a matter of adjustment from there.
Hope this is of help
Joe