There are two riffs to be repeated throughout the song. Riff #1 is the main riff, and Riff#2 
is played during the chorus. If you listen to it, youll find it.

RIFF#1
G|———————————————————2—————————|
D|—————————2—2—2—2—4————2—2/4—2|
E|—4—4—4—4—————————————————————|
A|—————————————————————————————|

OR

G|———————————————————2—————————|
D|—————————2—2—2—2—4————4—2/4—2|
E|—4—4—4—4—————————————————————|
A|—————————————————————————————|

The top one is correct, but the bottom one sounds cool. Its your choice, but the song 
is played as the top one I believe.

RIFF #2

G|—————————————————————————————|
D|—————————72—2—————2—2—2—2———|
E|—4—4—4—4———————0—0———————————|
A|—————————————————————————————|