From your Rep Kahuna Agency Dashboard, click Settings.
Next click WHITE LABEL.
Click Add New
From the White Label screen, you have the option to white label (or "mask") your entire domain (ex. myagency.com) or you can add a subdomain to your existing white label (ex. newpage.myagency.com).
Note: For more information on full/subdomains, check out this article.
From the White Label screen, follow the instructions shown in the in-app video to edit the A Record in the DNS settings of your Domain Host Provider's website to target the Funnel Pages IP Address as shown here:
Click Verify & Save
From the White Label screen, follow the instructions on the tab "Sub Domain" to create a new CNAME in the DNS settings of your Domain Host Provider's website using the information provided (in red) which will add a subdomain to your full domain.
Next, you will apply the domain/subdomain to the desired Rep Kahuna Page. For help with this, check out this article: How to Assign a White Label Domain to a Page.