Help setting up iCloud Contacts in BusyContacts.

I am trying to link my iCloud contacts data to Busy Contacts.

In BusyContacts, when I attempt to add my iCloud account, I get an alert that says, "iCloud requires a 16 to 19 characters long app-specified password, your normal iCloud password will not work. Click HELP for more information."

When I click Help, I am taken to a System Setting window (see attached.) There are no options for setting a different kind of long password. Any thoughts?

Thank you!