How Do I Open The Back Of Samsung Tocco Lite?

Put on a pair of rubber washing up gloves [trust me it gives you a much better grip !]
hold the phone  in one hand [screen side down -arrow pointing away from you  ] place thumb on arrow  firmly and slide away from you .
Hope this helps ,it worked for me

Press down on the arrow and pull down. This might take a few tries. I couldn't get it open first time either, now I just rip it off.

Listen to mosh6

Be gentle push it down n pull where the arrow says

I came here to find out how to remove battery back
your asking me to tell you

No, you have to lift it up and slide, then it just slides back on afters