There are many ways to play this, but this is how to do it with standard tuning.

Intro (Come in after main guitar riff with drums, etc)
G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  x2
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|

Intro (continued)
G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|
E ---------6-6-6-6-8-8-8-8-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|

Verse
G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  x3
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|
E ---------6-6-6-6-8-8-8-8-8-8-8-8-|

Refrain 1 (I wanted more...)
G ---------------------------------|
D ---------------------------------|
A ---------------------------------|  x3
E -1-1-1-1-4-4-4-4-8-8-8-8-8-8-8-8-|

G ---------------------------------|
D ---------------------------------|
A ------------------------5-5-5-5--|
E 1-1-1-1-4-4-4-4-3-3-3-3----------|

Verse
G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  x3
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|
E ---------6-6-6-6-8-8-8-8-8-8-8-8-|

Refrain 2 (Pink ribbon scars...)
G ---------------------------------|
D ---------------------------------|
A -----------------6-6-6-6---------|  x3 
E -1-1-1-1-4-4-4-4---------6-6-6-6-|

G ---------------------------------|
D ---------------------------------|
A ------------------------5-5-5-5--|
E 1-1-1-1-4-4-4-4-3-3-3-3----------|

Pre-bridge (same as intro)
G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  x2
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|
E ---------6-6-6-6-8-8-8-8-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|
E ---------6-6-6-6-8-8-8-8-8-8-8-8-|

Bridge (I want to turn you on...)
G ---------------------------------|
D ---------------------------------|
A ---------------------------------|  x3
E -1-1-1-1-4-4-4-4-8-8-8-8-8-8-8-8-|

G ----------------| 
D ----------------|
A ----------------|
E 1-1-1-1-4-4-4-4-|  Go right into ending

Ending (same as intro)
G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  x2
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|
E ---------6-6-6-6-8-8-8-8-4-4-4-4-|

G ---------------------------------|
D ---------------------------------|
A -6-6-6-6-------------------------|  
E ---------6-6-6-6-4-4-4-4-4-4-4-4-|