Why cannot you e-file your tax returns? Do you have any taxable income entered on your tax return? Are you only receiving Social Security benefits and have no other income?
See this TurboTax support FAQ for changing from mail to e-file - https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online...
