verse: 
E|---------------------------------|
B|---------------------------------|
G|--------5------7------3----------|
D|--------5------7------3----------|
A|--------3------5------1----------|
E|---------------------------------| (x2)

last time before chorus (third time playing riff): 
E|--------------------------------------|
B|--------------------------------------|
G|--------5------7------3---------------|
D|--------5------7------3---------5-----|
A|--------3------5------1---------5-----|
E|--------------------------------3-----|

chorus: 
E|-------------------------------------------------|
B|-------------------------------------------------|
G|--------5------9------3--------------------------|
D|--------5------9------3----------3----2----3-----|
A|--------3------7------1----------3----2----3-----|
E|---------------------------------5----3----1-----| (x3)

last time before verse (4th time playing chorus riff): 
E|----------------------------------------------------|
B|----------------------------------------------------|
G|--------5------9------3-----------------------------|
D|--------5------9------3----------3----2----3---5----|
A|--------3------7------1----------3----2----3---5----|
E|---------------------------------5----3----1---3----|

Repeat above to finish the song: EXCEPT 
the 2nd verse is only half as long as the first... 
so instead of playing verse2 (x2) just play is once. 
It's that simple!