apple pro logic x track bounce to mp3 at 320 kps

I am looking for assistance in overcoming what I believe to be a glitch in my apple logic pro x 10.7.4 software. I am attempting to bounce a track by formatting it for radio play. I clicked the mp3 format in the bounce destination area, but the destination area is not for an MP3 bounce where you can select the bit rates. I think the destination area is stuck on the PCM destination area and I have no idea what to do to bring up the destination area for mp3. I even reloaded the logic pro x application but to no avail. I have uploaded an image of the destination area I am getting and also a screen shot of what the destination area should look like. Thanks for anyone who can help figure this one out.