You can change the portal site properties and the site creation settings.
The following character limitations apply:
The portal site name can consist of all alphanumeric characters except for the following: \ / : * ? " < > |
The portal site description can consist of all alphanumeric characters, as well as the following: # % * + \ | " ? $ @ [ ] { } ⌂
The URL for the portal site logo can consist of all alphanumeric characters except for the following: # % * + \ | " ? > < $ @ [ ] { } ⌂
The following file formats are supported for the graphics file: .gif, .bmp, .jpg, and .png. TIFF files are not supported.
The URL must end with /_layouts/language/scsignup.aspx.
The name appears on the home page of the portal site.
If the file location is a local relative path (for example, /_layouts/1033/logo.gif), you must copy the graphics file to that location on each front-end Web server.
If you do not type a URL in this box, users will create sites from the default site creation page for this portal site.
The default URL for team site creation is http://server_name/_layouts/language/scsignup.aspx. If you have previously typed an entry in the URL box and want to return to the default, leave the URL box blank.
If the file location is a local relative path (for example, /_layouts/1033/blue.css), you must copy the cascading style sheet file to that location on each front-end Web server.
For better performance, it is recommended that you copy the file to the _layouts folder on each front-end Web server.