Any info on pricing to join? I'm assuming the free version doesn't get you much from the site.
You can view profiles but cannot interact, i.e. send messages, etc.
Best to sign up, fill in a profile and wait a few weeks for their marketing team to send you a subscription offer. Typically, this would be 25% and, if you don't respond to that, you might get a 33% later down the line.
Read this mega-thread, and the one on the main UKP board to familiarise yourself with how to not get banned from the site, approach potentials, and so on.
