Step 1:  Login to WebsitePanel

Step 2: Select Web and then Web Sites







Step 3:  Select your domain name. You will be directed to the Web Site Properties page

Step 4:  Select Extensions tab



Step 5:  Select the desired version




Step 6:  Click the Update button to finish the process



In addition to ASP.NET, you can also enable ASP, Perl and change the version of PHP.