#1
ok so i was looking at the highway to hell tab and i was have 2 questions

e-||--------------|-------------|---------------------------------------||
B-||o-2--2--2-----|-3--3--3-----|-3--3--3----3--3--3----------2--2-----o||
G-||--2--2--2-----|-2--2--0-----|-2--2--0----2--2--0-----2----2--2------||
D-||o-2--2--2-----|-0--0--0-----|-0--0--0----0--0--0-----0----2--2-----o||
A-||--0--0--0-----|-------------|-----------------------------0--0------||
E-||--------------|(2)-2--3-----|-2--2--3----2--2--3-----2--------------||


1 - im not sure how to play that chord with no a string

2 - when it has the one with the (2) what does that mean here
#2
Try muting the A string with a finger that your not using by gently resting it on it. And when the 2 is in () it just means that its optional