Hi @Mbali_Jacqueline, welcome to our forum!
As @alexdon wrote, make sure that the headset is set to pairing mode so the device is able to find your headset, then go to Settings > Device connection > Bluetooth > activate it and should see the accessory in the list here > tap on it to pair.
Do note that some headsets can only be paired to one device at the time, so if you already have it paired to another device, you may have to reset it.
Let us know how it goes!
