If you're using Internet Explorer, you don't really have to change your overall security settings.

Click "Tools" on the top bar.

Click "Internet Options" on the menu that drops down.

Click the Privacy tab at the top of the menu that opens.

Click the button marked "Sites."

Type "mudcat.org" (without the quotes) in the little box.

Click the "Allow" button.

This will let your browser accept a cookie from mudcat, but will have no effect on how it acts at other sites.

Other browsers should have similar settings.

John