I need a bit of help. I have just used websitegrader.com 's free analyser and one of the sections was as follows:
Permanent Redirect Not Found
Search engines may think www.mydomain.com and mydomain.com are two different sites. You should set up a permanent redirect (technically called a "301 redirect") between these sites. Once you do that, you will get full search engine credit for your work on these sites.
Is this true, and if so - how do I do a 301 redirect because it doesn't matter which one I type in - it goes to the same website ?