I think I have found the manual (I'm sure I have) and it is the poorest manual I have ever seen, shockingly bad and unhelpful.
I did however find this elsewhere online:
Place the Bluetooth device into pairing mode. Refer to the device's instruction manual if needed. In the TV menu, go to SETTINGS > ALL SETTINGS > SOUND OUT > USE WIRELESS SPEAKER. Then select your device's name from the list of available devices. After the device has been successfully paired, it will show under the registered devices.
I hope that helps. I'm glad you've sorted the sound quality out - I've been using Clear Speech and it really does help. If you also have the option to 'equalise volume' or similar, try that too. It keeps the volume at an even keel so you don't get deafened by adverts or strain to hear when people are whispering.