Pro Publishers can contact us via the special support email mentioned in the payment confirmation email, shown below. We make every attempt to "fast track" Pro questions, but keep in mind the response time will depend on the complexity of your question/request!
Billing confirmation email gives dedicated support email
Pro Publishers can also receive emails with PRO tips that mention our dedicated PRO help email address. We will email PRO publishers only if your email address has been verified -and- you have selected in your publisher account settings the option to receive notifications regarding occasional updates/tips. To adjust these settings visit your Account Settings > Email & Social Channel Login.
You can also Submit a request to support.