Click the \"Create a New Public Profile\" button and enter the name want to use for your new alias (you can have up to 5 aliases in a single account). Fill in the rest of the form with any information you would like to have displayed in your Profile. When you are done editing, click the \"Finished\" button to return to the Profiles edit page. From here you can make any other changes to your Profile.
Remember that you can't change the name of an alias once you create it, but you can change your public Profile information at any time.