Silly question about the Pro 2

[nitrotrike]

Ok, the phonebook is done. I was going to post this question elsewhere, but hopefully someone here has an answer about the messengers and I wont have to scour the forums. I was using yahoo and it works fine. How do i get back to the sign in to use the others (aim / msn)? It will let me enter name / password info, but there isn't a "sign in' option. Am I missing something????