The whole song is repetition of the following two lines.
e|----------12----------12------------------12----------12------12-----------|
B|--12--13------12--13------12--13--12--13------12--13------12---------------|
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------| repeat throughout
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|
e|----------12----------12---------------------------------------------------|
B|--12--13------12--13-------------------------------------------------------|
G|---------------------------------------------------------------------------| on last measure of repeat
D|---------------------------------------------------------------------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|
If you're playing it live, feel free to hit the low open E whenever you play the 12 on the b string.