Is there a simple way to add a link to a blog author's profile or a signature to a blog post? I thought about using the Forum profile system, but don't know how to link the two. Thanks
Is there a simple way to add a link to a blog author's profile
A simple way no. The module doesn't provide that functionality. You would have to write your own controller and template. You could use the ForumMemberProfile class as an example but that is a lot more complex than what the blog would need.