You can't do them online not anyway since it is after October 15 which is the last possible date to use online software. You can either buy a downloadable Turbotax product or go to the IRS website and get tax forms. Or use a CPA locally.
If you started your online return prior to the October 15 deadline, you may still be able to finish it and efile it online through October 31. Here's an image of a banner I see at the Tax Home when I log in for an unfiled return that was started prior to October 15. If you see such a banner at the top of the Tax Home page, you can probably finish your return and possibly efile online. It does let me continue working on my unfiled test return, but I can't really test it to see if it will indeed allow an efile. You can try and see if it will let you. If it won't, you'll have to print, sign, and mail the return.
That being said, I'll try to guess what code you are referring to, since you didn't provide any explanation.
Are you trying to efile and having trouble receiving the 6-digit email verification code to finalize your efile? If you need to, you can change the email address that the code is sent to by going to the left menu column, scroll down and click on Intuit Account, and then the tab "Sign In and Security."
This FAQ has a video that shows how to do it:
FAQ: What if I'm having trouble with my filing verification code?
NOTE: When you go to retrieve the code from your email, remember to use a second tab or second window. All modern browsers should have the capability of a second tab or second window. You have to leave the first screen open that asks for the code. If you close that first screen, then the code won't work. Another option is if you have a smartphone, you can retrieve the code from your email using your phone while leaving the screen open on your computer that's asking for the code.
Also, that banner warns of possible late filing fees, but if you are due a Federal refund, there is no penalty for a late Federal return. If you owe Federal tax due, however, then there could be penalties for filing late and for paying the tax due late.
Professional tax programs allow efiling for the last 3 tax years until the IRS blackout happens to allow the switch to the new tax year ... this blackout period is usually from Dec to mid Jan. I have never seen any DIY programs extend the efiling for new returns past 10/15 and resubmissions of rejected returns past 10/20. Is this something new this year ? If it is then it needs to be better explained and if it is not then the screens need to be corrected asap.