Thanks for the reply Ann! David, SEOmoz and MyBlogGuest are different products, you'll probably find the best help for MBG talking with Ann or using her support forums.

Thanks for this helpful information. In the future, it'd be great if you could add the links that cite your sources, and indicate which portions of your answer have been reproduced from existing content.

Have you read the Link Building category of the SEOmoz blog? Take a look at http://www.seomoz.org/blog/category/4 and you might also get some more ideas for building quality links (both for forums and in general).