You're going to grab the parameter object from the query string and display using a LoginName control from the toolbox. LoginName is perfect because that's exactly what it displays if the user is login and has a login link if they have not.
Are you using a Response.Write? That's usually how I've seen it work, it writes at the beginning of the file, before the DOCTYPE and everything. Make sure you have a control with a text property, I prefer asp:Literal, and that you're setting it's Text property. (Assuming this is something different from the problem above, LoginName should display text, wherever you drop the control.
Good luck with Master Pages, I would never go back to trying to maintain my site without them. :)
Whatever you can do or dream you can, begin it. Boldness has genius, power and magic in it. Begin it now.
-Johann von Goethe
When Two Hearts Race... Both Win.
-Dove Chocolate Wrapper
Chroniclemaster1, Founder of www.EarthChronicle.com
A Growing History of our Planet, by our Planet, for our Planet.