How to Configure DKIM with a Domain Purchased from Google via GoDaddy

Does anyone know how to properly configure DKIM? I’ve already generated the DNS key, but I’ve encountered an issue: when I log in to the GoDaddy website, my domain isn’t visible in their database, and I can’t add it. For clarity, I purchased the domain through Google, but its owner is GoDaddy. Has anyone faced a similar issue and knows how to resolve it?