HBM 730 Bluetooth Headset Wireless Headset: what is the mfb on my bluetooth headset and do i t...

I don't know your headset in depth, but MFB stands for Multi-Function Button. Headsets usually have one big button used to make, answer, and end calls. There may be other buttons, too, like volume up and down. To turn your headset on, press and hold the MFB for some seconds, until its indicatior light flashes. To turn it off, press and hold the MFB again, until its indicator light is turned off. To put it in paring mode (starting with the headset powered off), press and hold the MFB much longer than the time required to turn it on (you'll notice that it will flash as if it was turning on, but keep pressing the button). Headsets indicate they are in pairing mode when the light either keeps flashing rapidly (sometimes in more than one color), or stays solid lit, As I've said, I don't know how yours will behave, but you will find out. Once it is in paring mode, make the bluetooth application on your phone search for new devices. After a while, the HMB-730 will appear on the phone screen. Select it and make the application proceed. If a paring code (or PIN, or passkey) is requested, enter '0000' (four zeros).
Hope it works for you.
Cheers! Carlos