1. Log in to the Plesk control panel.
2. In the menu on the left, click on Domains.
3. Select the domain for which the certificate was issued.
4. Click on SSL/TLS Certificates.
5. Next, click on the Add SSL/TLS certificate button
6. Enter a custom name for the certificate and fill out information about the owner according to the completed form when ordering an SSL certificate.
7. In the “Upload certificate” field, enter the data of your SSL certificate as text according to the table of contents of the fields and click the upload button at the very bottom of the page.
8. Next, go back to the Domains section and click on the hosting settings item for the domain you are interested in.
9. In the Certificate drop-down menu, select the previously installed SSL certificate and click on the “OK” button at the bottom of the page.