FL Studio. I finally got it to record which I was so happy about

I don't have monitors I am just running the sound through my headphones for when I record. Even when I sit there with the headphones I just hear the static from the mic. I'll look around in FL. I thought maybe it was a Tascam thing because I don't know what the top left knob does...sorry I am really knew to recording and this is my first setup.