Originally posted by arazas
For SSL, domain must be on dedicated IP else SSL will not work. Make sure dedicated IP assigned to that domain.
Next
Login to Plesk > Domain > Certificate > Add new request > Fill form click on request > this will genrate CSR and Private Key > Now apply for SSL certificate using CSR and once issues install it in Plesk > Domain.com > Certificates > Click on created request > copy/paste certificate > click on send text . Cheers! You have installed it.
Now Plesk > domain.com > Setup > Select SSL option > and also select SSL crtificate from above combo box.
Now done!