I e-filed my tax returns. What is the meaning of the following statement? "sign and date Form GA-8453 within 1 day of acceptance"

I just e-filed my 1040 Individual tax returns using Turbo Tax Deluxe. 

Need to sign: The electronic instructions for filing says to "sign and date Form GA-8453 within 1 day of acceptance," but the online version would not let me sign this before e-filing. 

The only signature (5 digit signature ID) the online version asks is for your consent that everything is truthful to the best of your knowledge.

Do Not Mail: It says to not mail a paper copy of my tax return.