the tabber is trying to say that the chorus and verse are the same as the intro. if youre able to read notes then youd notice that 3 on the E is the Gminor, 1 on the E is the F major, 3 on the A is Cminor, and 1 on the A is A#major or Bbmajor. youd probably just play the intro over again through the chorus and verse and then do the last riff when your supposed to. Im guessing that this is a rock tab but if it wasnt, if it was jazz or something you would take the root and do a walking bass line. for example if you had the F major you would take the chordal tones or the notes 1, 3, and 5 of the mode or F major scale and play 1, 3, 5 leading tone into the next chord which would be Cminor so you would play F, then A, then C, then leading tone to C which would be B. If you want to get a better bass line for the song you could just do this for awhile and im almost sure it would make the bass line sound better than it is. Sorry if i gave you too much info.
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- Jon
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