Verify a custom domain

Hi, I attempted to verify a custom domain (https://azure.microsoft.com/en-us/documentation/articles/active-directory-add-domain/#verify-a-domain-at-any-domain-name-registrar), however, I can't find "DNS settings or View DNS settings" button or link, I configured SSO scenario. As I click verify button, it directs me to the directory integration tab, and then nothing happen.

How can I see my "DNS settings"?

Thanks.

Liu-xiang Chen,