After purchasing the certificate there will be 1 credit available certificates.
- Inside IIS generate a renewal cert.txt
- Copy the new cert txt into the Godaddy cert tool.
- Use the available certificate and download it.
- Use the following directions to import the new certificate into IIS and the local certificate storage.
http://help.godaddy.com/article/4875
Once it's imported into IIS and seen by choosing View inside the default site in IIS run the Secure Gateway Configuration Wizard located in Start > Programs > Citrix > Administration Tools > Secure Gateway Configuration Wizard
Choose the new certificate, you'll need to choose View on each one listed to makes sure you use the correct one. Choosing all of the default values after selecting the correct cert click next until the end. Keep the checkbox and click Finish. THis will restart Secure Gateway and make the site use the correct certificate.