Activate Gmail for Google Workspace (registrar-specific steps)
Update your domain's MX records to use Gmail with Google Workspace. You add and manage MX records at your domain registrar's website, not at Google. Click your domain registrar below for exact steps. If you’re not sure who your registrar is, go to Identify your domain registrar.
I need general instructions, because my registrar isn’t on this list.
Tip: To continue using your current email provider, you don't need to update your MX records.