You have posted this question twice. Here is my answer in your other thread:
If you mean the BeePre 300B Pre-Amp, then the output is from the two sets of jacks at the back right - XLR's and RCA jacks in the standard configuration. The three sets of RCA jacks inboard are the inputs.
So, left to right: Input 3, Input 2, Input 1, Output 1 (RCA) Output 2 (XLR)
The Coarse & Fine are the Attenuator (volume control) adjustments. Initially set them to 0! Then set the Coarse control to the general listening level you want, then use the Fine control to adjust the level to exactly where you want.