BSK Forms Blacklist supports Gravity Forms and Formidable Forms.
For free version or PERSONAL license in Pro version it can only choose one form plugin to support. It default to support Gravity Forms.
For CREATOR license or above in Pro version it can choose all form plugins to support.
Navigate to your WordPress --> Dashboard --> BSK Blacklist --> Settings, you'll see setting page link as the following.
Free version or PERSONAL license in Pro
CREATOR license and above in Pro
Purchase BSK Forms Blacklist