sheena is a punk rocker-ramones

h: hammer-on

intro/main riff:
G|--------------------------------|
D|--------------------------------|
A|1h33-33-1h33-33-1h33-33-1h33-33-|
E|--------------------------------|repeat until \"they\'re ready to go now\"

then play at 0:11:
G|------------------|
D|------------------|
A|------------------|
E|-3333333333333333-|then play the main riff again

after the main riff play this at about 0:17:
G|-------------------|
D|----------3-333333-|
A|-------------------|
E|-5-555555----------|

main riff again

then:
G|------------------|
D|------------------|
A|------------------|
E|-3333333333333333-|

chorus:
G|-----------------------------------|
D|-------------------------3333-5555-|
A|-333333-----------333333-----------|
E|--------1111-3333------------------|x2

then:
G|-------------------------------------|
D|-------------------------------------|
A|-33333333----------11111111-55555555-|
E|----------33333333-------------------|

main riff

then:
G|------------------|
D|------------------|
A|------------------|
E|-3333333333333333-|

main riff again

then:
G|-------------------|
D|----------3-333333-|
A|-------------------|
E|-5-555555----------|

main riff

then:
G|------------------|
D|------------------|
A|------------------|
E|-3333333333333333-|

I guess you can see a pattern in the song, anyway, put the riffs into the song as needed
any questions don’t hesitate to ask.