Hi, thanks for your question.
I would recommend that you update the return with your latest address, go through Review flow to make sure that the return is updated. Once you are done with Review, click 'Forms' on the top header and then the 'Print/File' button, that will take you to a page where you can print for your records. From there, click continue button and then click on 'Print Return to Mail'. You should see the print with the barcode that you can mail to the CRA.
Hope this helps.