For those that have never participated in an exchange on AO3 before, here's a quick guide to sign-ups. Behind the cut are step-by-step instructions, complete with images!

( How-to! )

I've had four or five questions about this, so I decided to take advantage of my day off and put this post together now, rather than hold off a few weeks :)

So! For those of you who have never used AO3 to complete a challenge before, here's a step-by-step guide, with pictures, laying it all out!

( The pictures are on the large side, FYI )