I entered a wrong access code and pressed the file button! now, fix this? CRA does not accept the file. How can I fix this?

I entered the wrong access code and pressed the file button.  

From the left side menu, select File > Filing Hub. Then continue through the NETFILE process. When you get to the "CRA NETFILE Info" page, you can enter or change your NETFILE Access Code.

You can find your NETFILE Access Code (NAC) on your Notice of Assessment from last year, or in your CRA My Account. You can also file without it, as it's optional.