This is a simple integration piece if you are using the core DNN forums and the Smart-Thinker UserProfile. If you look at my poker player profile on PokerDIY, I have a link "View all Forum Posts" near the top.
The core forum uses a simple URL to search by author, so it's very simple to modify the template to allow this:
a href="http://www.pokerdiy.com/PokerForums/tabid/378/pagesize/20/authors/[USERID]/scope/threadsearch/language/en-US/Default.aspx">View all Forum Posts</a>
You will need to replace the URL, but you can see the USERID token usage. You will need to put a "<" in front of that string.
Please start a new thread if you need help with this topic - I want to keep these informative threads clean.