Welcome to Android Central! Using Google Translate: "Hello everyone, here is my problem, I bought bluetooth headphones and a bluetooth receiver because I wanted to spin and not be bothered by the wire of the headphones and put the receiver in the jack plug of the bike and connect the headset on the receiver but impossible, I happen to connect my headphones or my receiver on my mobile separately but that's all, who could help me solve this problem?"
Can you tell us the exact Mpow model you have? Is it only a Bluetooth audio receiver, or is it a combination receiver/transmitter? If it's only a receiver, then it's designed to attach to wired headphones or speakers, converting them to Bluetooth headphones/speakers. If you're plugging a receiver into the bike's headphone jack plug, hoping that it will transmit the audio signal coming from the bike's audio system to your Bluetooth headphones, that won't work, unless the device has both receiving and transmitting capability.