Form a D chord and use your middle finger for the bending and TAB.

 Main Riff

|----------------|
|--------3------3|
|--------2------2|
|------0---3b-0--|
|--0-3-----------|
|----------------|

|-------------------|
|--------3---------3|
|--------2---------2|
|------0---3b-3b-0--|
|--0-3--------------|
|-------------------|

Repeat 2 times

Hit the bass note for each of these chords then strum the chord

G x4
D x4
A x4
D x4

Then go back and repeat the whole song 5 times and for the ending, just do the main riff 
and fade out.