I went through the online H&R free tax thing because I made less than $50,000 in 2010, and the entire way through I am looking for a place to add up my receipts

I went through the online H&R free tax thing because I made less than $50,000 in 2010, and the entire way through I am looking for a place to add up my receipts and pay my state tax on them, nowhere to be found. I have no way of calculating what else needs to be withheld, I don't have the money to go to a tax person to get it done there. Tax law has become so complex that a lay person can't get the job done without either paying someone to do it, or having to use software that may not include all of the options required...