Also, just a reminder (because I know it's a bit confusing), use the July 11-12 "PRELIMS SIGN-UP: ALL swimmers!" event to sign-up your swimmer(s) for prelims.  It will show a green, open "Meet Entry" button.  

The other Prelim events will show the Meet Entry as closed but the "Job Sign-Ups" will show as open, green buttons.

Hopefully that makes sense once you see it!

Toni