According to "U2- The Complete Songs," the chords for Please are as follows...(guitar down 1/2 step of course)...
Verse: Bm Bsus2 Bsus4 Bm
Please, Please, Please, etc: B5 F#5 B5 F#5 Bm Gmaj7
Love is Big etc: Bm A Bm A...
September etc: Bm
Please, Please, Please, etc: Bm Bm/A Esus4 Bm B Esus4
So Love is big: Bm A A7 Bm....
Edge is probably playing some sort of variation/s of this format. Perhaps even in a different key. That should get you started though.