Three Finger Tap and Four Finger Tap can be configured to perform the action you like by heading to Settings -> Gestures in Concepts. It’s really handy, but you might run into trouble if you’re using Concepts on Windows and existing operating system gestures are enabled on your device. 

To resolve this, head to your device settings, then to Bluetooth & devices -> Touch. Here, you should find a toggle setting called Three- and four-finger touch gestures. If this is toggled on, this is likely your problem. Your system settings will be overriding Concepts’.  Toggle this off and head back to the Concepts app to try again. 

Now, when using three or four finger tap, your selected customized action should be performed.