SPF is a technology that tells others servers it's you that is sending the emails and so the servers allow the email to go through.
DKIM is the unique key to your server.
To navigate to the SPF and DMIM section, login in to cPanel. Under the email section, click "authentication".
On the next page, you'll see the options to enable/disable (depending on what your currently set at) SPF and DKIM.
That's it! You now know where to go to enable and disable DKIM and SPF.