If you want to use Tax Software to file your Taxes for free then I would recommend using TurboTax Which is free Tax filing Software.
TurboTax is pretty easy to learn and file your taxes with and is what I used to use before I started using Credit Karma to file my taxes also for free.
Still if you cannot figure out the Tax Software which is pretty easy to figure out for most people you should hire someone to file the taxes properly for you if you cannot grasp the tax software.
TaxSlayer and Taxact are also great tax filing software that can help you easily file your taxes.