If your husband is not eligible to use NETFILE, he will need to print and mail his return. If you are using TurboTax Online, select File > Filing Hub* from the left side menu. Then click on "Print & Mail your return(s)" to go to a page where you can download a special version of your return to print off and mail. *If you don’t see the Filing Hub option under File, then select CRA Online Mail and continue forward from there to get to the Filing Hub.
You can also see the steps in this YouTube video.
This CRA webpage has a list of where you can mail your return.
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