I suppose you mean pairing a bluetooth headset to your mobile.
I don't know if you will find a step by step guide. It depends most times on what type of phone you have but the basics are:
1. Start your buetooth device.
2. Enter phone menu - Settings - Connectivity - Bluetooth.
3. Search for audio enhancements.
4. Add to your device list.
As I said, there are the basic steps, they might not apply for you, but I don't think you can harm anything by trying.
Hope this helps