Enter 54817 in the Port text box. DO NOT USE ANY OTHER PORT NUMBER. 54817 is the one you want.
Click Save, then Connect.
Intiface should now detect your device as connected.
Troubleshooting
If you run into problems, here's some things you can try.
If the Intiface Central Software sees the device connect, but you get an error or BuzzyBody doesn't maintain the connection.
Stop the engine.
Click on Forget device.
Start the Engine.
Attempt to Connect in BuzzyBody again.
If that doesn't work, you can try repeating it, but also restart Buzzybody.
If Intiface Central Software doesn't properly create a new device
Exit Central Intiface
Open the Intiface Central Configuration directory on desktop platforms
Windows: C:\Users\[UserName]\AppData\Roaming\com.nonpolynomial\intiface_central\config\
macOS: /Users/[UserName]/Library/ApplicationSupport/com.nonpolynomial/intiface_central/config/
Delete the buttplug-user-device-config.json WARNING: this will delete any other emulated devices you have setup!
Open Intiface, add the device, and attempt to connect BuzzyBody.
Those are the basic troubleshooting steps, messing around with a variation of restarting Intiface, re-adding the device, and restarting the BuzzyBody app will tend to get it working eventually.