To forget a Bluetooth device on your PS4™ console:
Step 1: Go to the PlayStation® 4 dashboard by pressing the PS Button.
Step 2: Go to Settings > Devices > Bluetooth Devices.
Step 3: Select the desired device from the list. SCUF Vantage controllers are named “SCUF Controller” in the Bluetooth devices section.
Step 4: Select “Disconnect” option.
Step 5: Press the Options Button on your PS4™ controller.
Step 6: Select “Forget Device”.
Step 7: Confirm.
If you do not have a controller already connected to your PS4™ available, you can alternatively download the PlayStation Second Screen application on your smartphone. Available on the Apple Store and Google Play Store for Android.