karen williams , Karen, hope fully one of the links below will show enough detail to enable removal of the back camera, to me it looks like it almost falls out once device is apart, perhaps yours has a little glue holding it in place and make take a little prying to ease it out(careful not to damage). Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
https://www.youtube.com/watch?v=UaeQzFwv...
https://www.youtube.com/watch?v=9lDOWB6e...
Samsung Galaxy Tab 3 7.0 Camera Replacement
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this may be a long shot but see if there are any other screws in there that may be attached to something that you can take out and make more room. also check to see if maybe the camera pops or can slide out.
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