Using the Ultimate Branding too, I would display the username inside a widget

Greetings.
Thanks for ALL your help.
So, using the Ultimate Branding too I want to create a widget guiding the user to spaces that will help them customize their new site. I would great them by name (whatever name they put in their profile). Can you tell me what the code would be that I would place in the widget to display Welcome (username).
Thanks!