It depends on the phone you have on how to enable Bluetooth from your phone. You should be able to go to the settings on your phone and enable it. If you have AT&T service they have some great device tutorials in which you can put in your devices and it tell you how to enable.
you should go to main menu select services, or settings and search for bluetooth and then select activate or the enable for the services. check whether there is a logo shown in the main screen upper corner.
It depends what phone you have, but usually the bluetooth access is where your media is or in your settings menu. Once you turn it on make sure you make it discoverable, as well as what you are trying to connect to.