Hi
@Elizgadus59 ... the link is at the beginning of every post that is titled, "XYZ Exchange Sign Ups are Now Open" until the sign up deadline. Once the sign up deadline passes, the link is removed and the title is changed to "... are Now Closed."
I always post the link to the sign up post in the "news" banner which is at the top right of the page as well.
I know forums are tricky to figure out but once you do, then it makes sense and is really quite logical in its layout. Everything is categorized and you can even click on "View the most recent posts on the forum" at the bottom of the page (in the stats) or the "Show unread posts since last visit" or "Show new replies to your posts" links at the top left under your name so you are sure not to miss anything.
Hope that helps!