My game is NOT done, but I want friends to test some stuff out. How do I extract a copy of the unfinished game (With a temporary ending) to give to my friends?

Publish it as normal, but keep it as private (unlisted). Give them the link.

http://docs.textadventures.co.uk/quest/tutorial/releasing_your_game.html

Thank you! I've also found out how to put it up for others. Alrighty, closed!

Although for others... There is the Publish option in the Tools tab.