Here are the instructions to set up SPF and DKIM records for the most popular cPanel email providers.
If your accounts are created on a different provider's cPanel, the instructions could also apply to your accounts.
Note: Please avoid creating two SPF records, as this will cause your emails to fail SPF authentication. Make sure you only have one SPF record in your domain DNS zone.
BlueHost
Hostgator
TitanMail