As I suggested before, why don't you try logging off of TBN, then logging back in to TBN and try making a post in the ATV forum and see if that works.
I cannot see the problem from this end and no on else is reporting a problem with it, so the first assumption I am going to make is the problem is on your end. Perhaps you can take a class at a local community college in basic computer operation, or ask someone in your area that is familiar with computers to show you how to do a few things on your computer. Copying and pasting is something everyone should learn to do on a computer.