On Version 8.x

1. Press the Settings button on the phone. 

   The display will show the following menu:

   
   

2. Choose Preferences. 

   The display will show the following menu:

   
   
   

3. If needed, scroll down until menu entry "Bluetooth"
   
   
4. Now choose Bluetooth and connect your bluetooth device. 

On Version 10.x

1. Press the Settings button () on the phone. The display will show the following menu:
   
   
   
   
   
2. Choose Preferences. The display will show the following menu:
   
   
   
   
   
3. Choose Audio. The display will show the following menu:
   
   
   
   
4. Now choose Bluetooth and connect your Bluetooth device.