From the Dashboard, after logging in:
- Click on Setup/Users, in the bottom-left corner.
- Locate the Accounts section.
- Click on Domains and Users.
- Highlight the domain in question.
- Click on Edit in the top toolbar.
- Click on the Verification tab.
- From the Available Sources field, choose the verification source(s) that you wish to use, and click on the right-arrow button to move them into the Selected Sources field.
- Click on Save and Close to close the domain properties window.