On a new installation of WordPress the "Add a custom form" link on Edit Page is missing.
An earlier installation, same host site, same version (3.3.2), same theme (Twenty Eleven 1.3), the link is present and functions fine.
I made another installation (again to the same host) and here also the "Add a custom form" link is missing.
Everything else appears to function normally.
What did I do wrong? What did I miss or not do?