Where is bluetooth in the menu – Audio Memos Pro Review

I bought this app, record while I am riding through my bluetooth headset microphone. But i see iPhone microphone all the time I record. Explanation shows that there is an option to choose bluetooth microphone but not in my menu??? Is there a chance to return this app!? I do not feel good, because I believe what I read on explanations before I buy. There is no bluetooth microphone option!!! Please send me information, what would you do for that.
Review by Cosmosist on Audio Memos Pro.