Though you can enable connectors for any custom module or standard module that displays in Studio, they are designed for company-type or person-type modules such as Accounts, Leads, and Contacts. The module must also have a standard Detail View layout.
To enable a connector for a module, on the appropriate connector tab, drag the module from the Disabled list to the Enabled List.
Click Save to saving the settings; click Cancel to exit the page without saving the settings.