Alright... if you read a tab at the top it will say what the tuning is... so u tune to that tuning. Then there should be six lines. correct? the lowest string is the lowest line get it?? Then each number represents a fret, then you play that fret at the certain time like this...
|-------------|--------------------| <-- high e
|-------------|--------------------| <-- B
|o-----------o|-4--4--4--4--2------| <-- G
|o-----------o|-4--4--4--4--2------| <-- D
|-------------|-2--2--2--2--0------| <-- A
|-2-2-2-2h0-2-|--------------------| <-- low E

Each person has their own way of tabbing and it is usually put at the top of the page... but on this one... the little circles mean repeat, the 'h' means hammer down, and the vertical lines are just separators it looks better in smaller font size. ok try this little piece out and tell me if you get it down ok?