Simply: Edit the index.html file for the template and move the {website} tag to where the {username} tag was before.
Not so simply: You'll need to make some CSS changes if you want to keep your styling. Unfortunately i'm at work right now so I can't give exact details, but I think username
was something like #postheader #username and website is #postfooter #website I can't really remember... you'll need to match the new location of the {website} tag to it's container ID in the CSS.
You might not need to change the CSS actually, just try it and see
Oh... there might be a strange layout issue after that though, I can't remember if the {website} tag has some hard-coded layout attributes in the Component class. It might, it might not. Once again just try it and let me know how it goes, i'm saying that moreso you know I can further guide you should it still not look right