How Can I enable DKIM under the updated version of Cpanel?(Please help me out)

Hello fellows, I am a website owner and just connected my custom email with Gmail. it allows my gmail to receive and reply customer emails by using the Cpanel email address. Unfortunately, when I proceeded to the last step where I need to edit the profile photo rather than a generic one. I need to Gmail to authentificate Cpanel email, then I can use the Cpanel E-address to log into gmail, In there, I can easily upload the headphoto. Now, the problem is I can not find the "Authentification" Icon under Cpanel/Email section. Only "Email deliverility". If you konw the solution, please share with me. Appreaciate your help.