Click again on the answer slide (close to the words) and it will link back to the main board and you should see the questions you've already chosen are now blue and so you choose another white one. I did not do an answer slide; it would've been a good idea. You could print thumbnails of the slides and that way have an answer key in the meantime, but I think I will look into making one for future versions. Thanks for asking about it and I hope your students enjoy it!