How do I put the member's name at the top of the discussion forum?

Tutorial

You can use the first name on the Forum Page itself (it won't work on the forum master index page)

Edit the Forum, in the 'Rules to Appear on the Forum Main Page' box place this code:

<cfoutput> #Request.Session.FirstName# </cfoutput>

That coding will place the members first name wherever you would like it.