Get your taxes done using TurboTax

Still very confusing to me! I use the tools come up with the results and have no idea what these #'s mean or where they should go. Do I need to have a certain amount of Federal taxes entered on the W4 in order to get more taken out of my paycheck every 2 weeks? I claim 0 so I thought the most would be taken out and they are ONLY taking $20 for Federal Taxes every 2 weeks, please help!