Donna, welcome to the forum, it'll get easier as you read and learn. Carl is, of course, right about the bleach concentrartions and gauging the addition by that. Something that isn't usually mentioned is that the perameters we shoot for here are broad enough that adding a little more or less will put you in the desired range, and , if you don't have a problem (if you're a little over or under what's suggested) then there is no reason to add more 'stuff' to your pool. Every pool is unique and as such has it's own chemical requirements - if you stay close to what is advocated here, you will most probably have no problems!
Go ahead and dump your 1 1/2 - 2 gal of bleach in the pool and I'll lay odds that you'll be ok If you have more questions, don't be shy about asking (and give the forum a good read and especially Poolsolutions. com [the site that mothered this one])