SPF and DKIM are systems setup to help your mail reputation by signing the email via the DNS system, to prove that the email came from your domain legitimately.
The first step is to log into your cPanel account. If you are unsure on how to do this, please view the following help article - 'How to log into cPanel'.
Once you have successfully logged in, scroll down to the 'Email' section as per the below. Select the option 'Authentication' as shown.
The authentication section will provide a status whether your account has SPF and DKIM enabled. In the example below, both are marked as 'Disabled'.
To firstly enable DKIM, choose the 'Enable' option under the DKIM heading as shown.
Once chosen, the process will confirm that DKIM has now been enabled. Choose the 'Go Back' option to return back to the authentication section to enable SPF.
Now finally choose the 'Enable' option under the SPF heading as shown.
The process should also now to confirm that SPF has now been enabled.
Enabling SPF and DKIM is now complete.