To do any prior year now, you must use the Desktop software on a full MAC or Windows computer.
…….....and the resulting paperwork must be mailed in by you...no E-filing at this late date for 2018 or 2017. Each set of paperwork must be mailed in using a separate envelope for each year.....and remember...the state forms do not go to the IRS...they go to your state's tax department (if your state has an income tax)