Can't paste into text box?

I have a large and long text box. At the bottom of the main body of text but still within the same text box, I want to copy/paste a few other elements from other pages: copyright notice, Twitter and Facebook items. But I can’t.

I’ve tried sending the main text box backwards, but nothing seems to work. What am I doing wrong?

Sorry @PeterCrosbie but I’m unclear on what you are trying to do from your description, could you perhaps share a screenshot?