I think you are being a real noob here. First one, why would you pay your account with a Paypal if you can just pick a normal browser, mozilla firefox or chrome? Second, from who are you hiding from? this is a forum, not a hacking site, this is not the deep web where you log in and your address and identity will bw revealed. I am a member of these forum for a while now and I still here, no problem, not even hacked for once. People do that if they have important files or documents in their site or money into it, accessing just these forum by Tor won't help you because the siteare not having that kind of people.
I just want to create a profile that is not in any way linked to my normal accounts. Reasons are not relevant.