If you need a signed copy, then print it and use a pen to sign on the line that says "Sign here." When you prepare your return using the software and you e-file it, there is no physical signature--you "sign" it by entering a PIN or your 2018 AGI. If a lender, etc. wants a signed copy for some reason, then you sign it in ink yourself.
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-a-return-i-filed-thi...
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