Attach your condenser microphone to a mic stand. A mic stand is helpful if you are singing into a microphone and you don't wish to hold it.
Connect the female end of your XLR cable to your condenser microphone.
Connect the male end of your condenser mic to your preamp. A preamp is necessary to power your microphone. Preamps normally provide 48 volts of extra electricity and sometimes offer special effects for the sound you run through it like equalization and echo. Most condenser microphones require phantom power
Connect your preamp to your recording system via XLR cable. You will likely use a console mixing board.
Space yourself about six inches from the front of the microphone. Unless you want your singer to sound really close to their listener's years, you should stay a few inches away.
Speak into your microphone at a medium-high volume to test the levels. If you are too loud or too quiet, adjust the volume of your preamp first, and then adjust the volume on your console. Your preamp will have a level meter. Make sure your levels are in yellow.