Secure Zone ID: To get the ID of your secure zone, you need to go to: Admin > Site Manager > Secure Zones and then click on the Secure Zone you want to add to Muse and up in the URL bar you will see the ID of the Secure Zone. It will be something like "/Admin/ZoneManagement_Details.aspx?ZoneID=51". The ID you are looking for in this example is '51'.
Secure Zone Heading: This is just the heading you would like to show on top of the Secure Zone login form. You can enter any heading here such as "Members Login" or something similar.