You need to run the "applications manager".
If you open the icon labeled "Apps", "setting should be in there on one of the pages.
Once you are in "Settings", scroll down to the "phone" section.
There you will find "Applications", open "Applications".
The top of the list should be the "Applications manager".
You will see a list of "All apps", Some of them came pre- installed on your Galaxy Tab, and can't be deleted. But they can be forced to stop and disabled.
Apps that you have installed that you want to delete can be
"Uninstalled".
Good luck!
Without knowing what case you have that is a hard one? turn Your phone around in case from left to right! if the buttons are not in slots provided then the power button will be pushed in! Note as I said, have no pics, can't tell what kinda case You have!