I've noticed on this board and others that it is common to get "stuck" in the quote box.
There is an easy fix!
You just need to delete everything. It can take a lot of back spacing, but if you remove your text and all of the text that you are quoting, you will end up with a small blue box. You should be able to do one final back space at that point and you will be out of the box.
The day the Bump died - Jasper is wise