With cPanel 11.25 update, cPanel introduced Simply DNS Zone Editor
to allow user to create and delete A and CNAME records in a domain's zone file.
1. Firstly, log into your cPanel account and select on the Simply DNS Zone Editor
2. You are allow to insert A record and CNAME record as below.
3. If you are adding an A record, do as the example as below.
mail.domain.com IN A 184.108.40.206
If you are adding CNAME record, do as the example as below.
mail.domain.com IN CNAME domain2.com.