Turn on your computer and open the recording software.
Plug the Behringer mixer into a standard electrical outlet. Note that Behringer and some other mixer brands do not feature power switches and are turned on by virtue of being connected to electricity.
Insert the two 1/4 inch plugs of the connection cable into the mixer's left and right "Main Out" jacks and insert the single 1/8 inch stereo plug into the microphone input on your computer, usually colored red.
If you own a Behringer USB mixer, plug the small connector of a Type B USB cable into the USB slot on the back of the mixer and the standard USB plug into your computer's USB slot. The 1/4 inch to 1/8 inch cable is not necessary with USB mixers.
Plug your instrument or microphone into one of the channel inputs on the mixer with a standard musical instrument or microphone cable.
Connect the headphones (optional but recommended) by inserting the 1/4 inch headphone plug into the mixer output marked "Headphones."
Play your instrument or speak into the microphone while adjusting the "Gain" control on the mixer channel until the red "Peak" LED lights on the right side of the mixer illuminate. Continue playing or speaking while turning the gain control down (counter-clockwise) until the read peak light no longer illuminates.
Continue playing or speaking while turning up the headphone volume knob and main channel fader or rotary level control (depending on model) until you hear sound at a comfortable listening volume.
Arm a recording track in your recording software and turn the mixer's "Main Mix" fader or rotary control until the software's sound meter reads slightly below the red "Peak" indicator. Consult your software manual for specific instructions on how to arm tracks.
Click the red "Record" button on your recording software and begin recording.
Press "Stop" on the recording software screen when the recording is finished and press "Play" to listen to the recording track before continuing. Depending on your software settings and mixer type/connection, you may have to plug the headphones directly into the computer to listen to the track.
Consult your software owner's manual for specific instructions on adding additional recording tracks, saving and modifying recordings.