How do I setup DKIM?

How do I setup DKIM?

Couple of days ago I followed a notification from within the email interface prompting me to setup DKIM (SPF is already setup). I followed all instructions but didn't verify it because, well, it takes time for the thing to spread across DNS's, etc.

So today I login to verify and I simple cannot find the setup page, it is nowhere to be found. I've been searching for quite some time, I found help pages from Zoho Campaings and Zoho Mail teaching how to do it; I also found one post here teaching how to do it. "From the navigation bar, choose settings" or " You can enable DKIM for your domain from Zoho Mail's control panel" and " Log in to the Control Panel from https://www.zoho.com/mail/cpanel-login.html" none of these things actually exist - there is no navigation bar, there is no "email authentication" in the zoho mail drop down menu, the link to Control Panel on /cpanel-login doesn't work. The best I could do, after a lot of searching, was finding the DKIM setup page for Zoho Campaings, which is not the same place I setup the DKIM yesterday.

This should not be so difficult.