you should get some famous and high PR forums list and then start posting on forums when you get signature then you all post will be show as your backlinks.

Hi John i am agree with you

Yes, signature is the best way to promote your website on forum.....

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You are actually promoting your website now since you are using your forum signature to link to your site. You can also use your profile to say something about your products/services offered in your website. Look for forum sites that do not tag their outgoing links as "nofollow". You will gain link juice from this forums that will help improve your page rank. Look also for forums with related to your niche to attract relevant traffic to your website.

You want to know about forum posting or forum marketing for SEO?

Forum is the best way for sharing knowledge.... And you can get backlink with your signature ..

Signature or Forum posting is best way but it will give you a result after a passage of time. If you need urgent boos than try to employed "Mega Wheel" by "Profile Links"..