You are able to get the form 1040x on line from the irs.gov web site, and go to the section below that says form and you are able to print from there, if you need to download to pdf, in order to print correctly then you are able to do so as well.
However, you should be able to get the form from the FAFSA web site as well, you may just have a difficult time finding where its located on the website, its easier from the IRS.GOV