Rosemary-

I assume you mean to change the club's URL, such as from Hispanoamerican.freetoasthost.whatever to Hispanoamericano.freetoasthost.whatever.

The part you want to change is what we call the "master username". There is a space for it on your admin page. (It's the first item in the Website Settings group. At the top of the page, click the icon of the wrench to go to that group.) Change it there, click the "Update Settings" button, and you're done.

Note, however, that people's email address books, URL "favorites", links, and so on, will need to be changed! This is not a step to take lightly. If you're just setting up your club's web site initially, that's fine.

-Dave