Does your APX radio have Bluetooth installed and enabled in the flashcode? Also does the computer your using have bluetooth?
If not, you will need to upgrade your radio to have a bluetooth board or add the bluetooth option to your flash code.
If you do have bluetooth, you will need to do the following:
-Go to Radio Wide or Radio Ergonomics (can't remember which one) and check the box for Bluetooth Enable.
-Go to Radio Ergonomics -- Menu Items -- Then Add the menu item "BT" to both trunking and conventional.
(You will need a USB Programming cable to do these steps if BT is not setup already)
-Now, on your radio menu, scroll over and click BT and scroll down to Devices and click Find... At this point you should also go on your computer and click search for devices in your bluetooth settings.
Once your radio finds your computer, you can click pair and it will ask if the codes match on both screens, click yes.
-Now go to your APX CPS and in the top left bar you will see a drop down that says USB, POP, Bluetooth. Select Bluetooth.
-Assuming you did the pairing correctly, you should be able to read and write via bluetooth.
