I've typed in my PSN ID in my profile but it's not showing up on my posts on the forums. The XBL GamerTag and Nintenddo 3DS Friend Codes seem to be working fine from what I've seen, but I see no PSN IDs showing up.
As I stated in the original post for them, the PlayStation 3 tag will only display on the member's profile. Once a DOA online game comes out for PlayStation 3 then I will add it to the post profile display.
I'll look into the format issue but it would help if you tell me what it is you're trying to enter.