Me and my friend play acoustic guitar together and I was wondering

how i would go about using a capo on my guitar only. how do you change the chords? thanks.
Each fret you move the capo up is a half step, so go accordingly- if you have a capo on your 3rd fret and play an Em form, it's G minor and so he should play G minor to get the same chord.
Yeah, think of it as the fret number you have the capo on, the amount of half tones the chord is lifted. I hope that makes sense.