How do you get the back cover off?

On the 10" version, you use a plastic pry tool between the back cover/bezel. They can be a bit still at first. But once you get going, the leverage from pulling it off should help

"Charles, I posted instructions and the tool used to remove the back cover on your Galaxy Tab. Check the attached links,instruction and guide and plastic pry tool, Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

Samsung Galaxy Tab 4 7.0 Back Panel Replacement

iFixit Opening Tool"

Pry it off with a knife