How do you know if a forum has a "no follow" for backlinks / link building? SEO?

[Nuviman]

Ok. First of all install SEO for Firefox plugin. All no-follow links you will see in red.
If you want to have backlinks from forums - you can create forum profiles filling all the information about you and your website (use Roboform Plugin to speed up filling the fields in with your info).
Submit some valuable posts to the forum. But don't spam there with your link yet not to be banned in the first day. In about a few days later come back to the forum and activate the signature. Don't forget to include your backlink in the signature.
Always choose the forums with minimum PR4 (you can see this also from the SEO for Firefox plugin).
So build the backlinks and check your website rankings everyday and you will succeed!
Good luck!
PS See the links to the recommended tools below.