How do I modify the ProSites account page when using WHMCS provisioning?

How do I modify the Account page for a ProSite?
I have a ProSite created through WHMCS, on a monthly plan as per WHMCS settings.
But the Account page for that user says:

This site has been permanently given Medium status.
« Choose a different site

That is incorrect, it might be what ProSites thinks, but not what WHMCS knows.
Also, the user has no other sites.
Whatever I add to the Account page, does not show for a ProSite (ie a not-free site).