The Verify Compliance section of a marketing campaign email comprises a few checks that must be satisfied before a campaign email can be sent.
The banner indicated will turn blue if the following snippets are present within the email template:
$$unsubscribe_link$$
$$forwardtofriend_link$$
$$openinbrowser_link$$
$$tracker$$
$$mailing_address$$
If these are missing from your template, they can be added quickly by using the snippets dropdown and selecting Compliance Essentials and Mailing Address.
Save your changes. Click Back to campaign designer.
If all checks are met, the banner will turn blue.