Pot Limit Betting Preflop

[mrpotatoh7]

Can someone describe the betting of pot limit preflop and postflop using the example of a small blind of $1 and a big blind of $2. Playing live at our game, we are always confused of what the amount of the bet should be if we say "Bet the pot". I say the first bet the pot should be $7 (call 2 dollars and bet the amount of $5 for a total of $7). Also, if no one raises, then would the small blind only be allowed to raise to $6 (call 1 dollar and bet the amount of the pot of $4 for a total of $6). That discrepancy of $6 and $7 is what is confusing us, or does the small blind just get the shaft.