How to display username in pages | Peter's Login Redirect | Forum

I assumed I could use your username function to display the username or firstname dynamically on the page after login, but I was unable to get it to work. If I add the username command into the url as you would with a php string, it gives me a page error. If I put it into the page, it doesn't fill in the name either. Is it possible, and if so, how would I accomplish this? I would actually like to display the first name rather than the username ideally, as I will be registering members manually myself.

Peter, this plugin is a work of art. Thank you.

Alan