Add, edit, set HTTP Status Code, make active, delete URL redirect pairs.
To avoid duplicate content penalty from search engines like Google you should not have different URL's pointing to the same page (content).
Typical example is presented below.
Default DotNetNuke portal would point to the same page when using:
www.mydomain.com/default.aspx?tabid=36
www.mydomain.com/home/tabid/36/default.aspx
and with the SEO module in action also
www.mydomain.com/home.aspx
To avoid duplicate content penalty you should enter rewrite rules with the HTTP Status Code 301 (Permanent Redirect).
This would tell search engines that all URL's are now pointing to one page only and are permanently redirected.
Please do not enter domain name in redirect entries !