To add/edit your signature navigate Profile > Forum Profile in the main menu:http://www.topmommyblogs.com/mom-blogger-forum/profile/area,forumprofile/
Or if you are in your profile area, on the left above where it says Summary w/the little girl icon there is a member sub-menu. Navigate: Modify Profile > Forum Profile.
Scroll down to where you see Signature and add your info into the text box.
Your signature is where you should leave your name and if you want a link to your blog, fun saying or something like that. Using your signature makes it easier to sign posts and also helps keep off topic & spam links (possibly your blog link) out of the body of the post.