Hi neonix
... Do I have to rewrite it to paper, and then type it in text mode? ...
Those are difficult choices.

When I'm faced with a dilemma like that, I use my mouse to
highlight the desired text in Apps. Then:
1. Press Ctrl-C
2. Open editor
3. Paste text (Ctrl-V) into editor
4. Save contents of editor to file
You're in text mode? Save the file to a thumb drive if necessary
then mount and copy the file when in text mode.