Did you find the chart to change the key with a capo? Refer to it as needed.
If the first chord in the original song is D, puting the capo on the first fret and playing a D shaped chord makes that a Db. Play the same shaped chords as in the oringial song with the capo on the 1st fret all the way through.
The first chord is usually the original key of the song (simplified)
for Db only:
first chord capo on fret
D 1
E 3
F 4
G 6
A 8
B 10
C 12
Bear in mind that you can't really play with the capo much above 7. Your guitar starts to sound like a Ukalale.