E|-------------------|
B|-------------------|
G|-------------------|
D|----------[7]------|
A|------[7]----------|
E|-------------------|

The harmonic pattern above
is repeated for the verse.
It's pretty easy to "feel"
when you should play it.

Chorus

        How long?       ...To sing this song?

E|-------------------|---------------------|
B|-------------------|---------------------|
G|---------9---------|---------14----------|
D|---------9---------|---------14----------|
A|---------7---------|---------12----------|
E|-------------------|---------------------|

Play each chord once, and let it ring. 
The Edge/Adam play some kind of crazy U2 arpeggio
chords for the E, and i think they play the A bar chord
on the E string, but this sounds just as good.

But, if you DA LLY want to play it just like them, 
I think they do it like this --

E|-------------------|----------5----------|
B|---------5---------|----------5----------|
G|---------x---------|----------6----------|
D|---------6---------|----------7----------|
A|---------7---------|----------7----------|
E|-------------------|----------5----------|

-- but I'm not sure.

After Bono sings "How long to sing this song?"
go back to the verse harmonics.  Again, you'll
have to feel for it.  

The song order is Verse/Chorus/Verse/Chorus, and then
the outtro, I guess.  In this portion of the song
(which actually winds up being the longest), play
through the verse once or twice, then play 
this little riff twice --

E|---------------------|---------------------|
B|---------------------|---------------------|
G|---------------------|---------------------|
D|---------------------|---------------------|
A|---16----14----12----|----12----14----7----|
E|---------------------|---------------------|