As an Anti-SPAM tool, new members can't post links for their
first 25 posts or so....maybe it's 50. After that, and I think you're
most of the way there, you can post links, send & receiver Private
Messages, etc...If you look below anyone's post, you'll notice that
in blue is says write on wall, add as friend, and send pm.
You're missing the send pm thing, but will appear soon and then
you can do anything anyone else can do.