Just search for new bluetooth devices on your computer, open the app and press "Turn on visibility".
Then connect to the "Bluetooth Mouse" on your computer and you are ready to go.
By default, the app acts as a bluetooth mouse that is controlled by a touchpad you have on your iOS devices screen.
If needed, you can enable the jiggler once you are connected to a computer.
For Windows 11 users that can not find the "Bluetooth Mouse" device:
Go to system settings, Bluetooth & Devices and make sure the "Bluetooth devices discovery" is set to "Advanced".