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From your cPanel interface, click on 
Then click on :
Select your Cpanel domain:
Fill in the three fields below:
Links to retrieve intermediate certificates are provided in the e-mail you received with your certificate.
As indicated in the note on shared servers, the IP is not dedicated to your site, so you need to check the SNI box:
All you have to do is click on 
the certificate is now installed on your hosting, now http traffic must be redirected to https.