Please make sure the following things are present on your website –
Step 1: You have installed the Ultimate Addons for Beaver Builder version 1.20.0 or higher.
Step 2: You have installed & activated the WP Forms plugin. You will find it under WordPress Dashboard > Plugins
Step 3: WP Forms widget is enabled in UABB Module settings. You will find it under WordPress Dashboard > Settings > UABB > Modules, also make sure the WPForms Styler Module is enabled under WordPress Dashboard > Settings > Beaver Builder > Modules