After you file

what year? only 2020 can be done online. other years need a full PC or MAC and the desktop software for that year. since you do not have a printer, you can print the return to a PDF. places like Office Max, Staples, FedEx and others can print out a copy from the PDF.  call first to find out the cost.  if it's 2020, then there's an issue with the return if you can't submit it. most likely a form is not ready which means you should be printing for submission until it is.