I wanted to invite someone to Careers 2.0, but I can't find my invites anywhere on my profile page:
According to this answer, they should be "in the menu on the profile page, right above the messages link" - but I don't see them anywhere.
Not everybody who signs up gets invitations. Invitations are granted based on several criteria, one of which is how complete your profile is. Based on your screenshot, your profile is not very filled out, which is probably why you have not received any invitations to give out.