AutoSSL is a feature introduced in cPanel 58 which automatically installs domain-validated SSL certificates on cPanel domains. This can be initiated from both cPanel and WHM. 

• If you are trying to replace a valid SSL certificate from another provider with AutoSSL it will need to be manually deleted first (Or you will need to enable replacing old/bad certificates and wait until less than 3 days before the current certificate expires).
• You can do this in cPanel by navigating to Manage SSL Sites in the Security section.
• You can do this in WHM by clicking on Manage SSL Hosts or the SSL Storage Manager, both of which can be found in the SSL/TLS section of the sidebar.

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