To check if a name is already being used, use this search tool.
Type your name above (where it says “YourName”) to see if that user name is already being used. You can also choose not to have a username and just donate your CPU time anonymously (user name = anonymous).
You may choose any name you like, as long as it contains only letters or numbers (to insert a space, you may use the underscore “_” character). If you choose your email address as your username, we will use the full email address but NOT print the full email address. Instead, just the part before the @ sign will be used in any stats listing, etc. User names are also case sensitive.