1. Login to the Plesk 7 Control Panel.
2. From the left hand menu, select 'Domains'.
3. Click on the domain name that the certificate is for.
4. Click on the 'Certificates' menu item.
5. There is a button in the middle of the page labelled 'Browse'. Click 'Browse' and navigate to the location of the saved site certificate you received from Comodo. Selecting it, then select 'Send File', this will upload and install the certificate against the corresponding Private Key.
6. The certificate name will now appear in the list of certificates at the bottom of the page.
7. Click on the name of the Certificate from the list.
8. The box on the page labelled 'CA Certificate'. You will need to paste both the Comodo intermediate certificate and GTE root certificates from the .zip file you have received into this box.

   They must be pasted this in order, the Comodo intermediate certificate first, followed by the GTE root certificate, the result will look similar to the example below (Please note: no blank line between then end of one certificate and the start of the next):

   -----BEGIN CERTIFICATE-----
   MIIEyDCCBDGgAwIBAgIEAgACmzANBgkqhkiG9w0BAQUFADBF
   UzEYMBYGA1UEChMPR1RFIENvcnBvcmF0aW9uMRwwGgYDVQ
   .....
   zs1x+3QCB9xfFScIUwd21LkG6cJ3UB7KybDCRoGAADj
   vA2AOurM+5pX7XilNj1W6tHndMo0w8+xUengDA==
   -----END CERTIFICATE-----
   -----BEGIN CERTIFICATE-----
   MIIB+jCCAWMCAgGjMA0GCSqGSIb3DQEBBAUAMEUx
   VQQKEw9HVEUgQ29ycG9yYXRpb24xHDAaBgNVBAMTE
   .....
   IjeaY8JIILTbcuPI9tl8vrGvU9oUtCG41tWW4/5ODFlitppKApy
   bW1EDp3zdHSo1TRJ6V6e6bR64eVaH4QwnNOfpSXY
   -----END CERTIFICATE-----

9. Click the 'Send Text' button.
10. Now click 'Up Level' from the top right of the screen and choose 'Setup'.
11. At the top of the page, change the 'SSL Certificate' drop-down menu to the certificate you have just installed.
12. Click the 'Server' item from the left hand menu.
13. Click on the 'Service Management' menu item.
14. You now need to Stop and Start the Apache process.

NOTE: Restarting Apache will NOT work. You must stop the service, then start it again to complete the installation

NOTE: When you add a certificate, it is not installed automatically onto the domain or assigned to an IP address, but only added to the Certificate repository.

You can assign a certificate to an IP address at the Client's IP pool, at the IP aliasing management page, and during hosting creation on an exclusively granted IP.