You can include or exclude your domain from AutoSSL.
If your domain is newly created, wait for few hours so cpanel can automatically install an SSL on your domain. However, if an SSL is not installed on your domain even after 24 hours, first check the last log of AutoSSL from cpanel >> SSL/TLS Status >> Certificate Status.
How to Generate a Certificate Signing Request - CSR in cpanel?
For obtaining a certificate from a Trusted SSL Provider, the Certificate Signing Request(CSR) is...