You can follow below steps to install Free AutoSSL in WHM.
Step 1: Login to your WHM.
Step 3: Now, search where Service configuration option available. Tap on it!
Step 4: From service configuration, go to Manage service SSL certificates. You may view the option “browse certificate”. Before tapping on browse certificate, put a tick on below checkboxes such as FTP Server, Exim server, Dovecot Mail Server and Calender, cPanel, WebDisk, Webmail and WHM services.
Step 5: After putting a tick mark, click on browse certificate. From there, you will be redirecting to another part were you have to select the hostname.
Step 6: By now, you will be viewing the list of hostnames. Choose one for which you need to install AutoSSL certificate.
Step 7: After choosing the hostname, now tap on the button “Use certificate”.
Step 8: Finally, click on the button “Install”.