Step 1: Login to the cPanel account.
Step 2: Click on Simple DNS Zone Editor in the section Domains.
Step 3: Select the domain from the drop down list.
Step 4: Go to A Record and click Edit option followed by the domain name.
Step 5: Enter the new IP address which you want to update and click 'Save changes' button to apply the changes.
Step 6: Also, set a TTL value for the A record.