Click "Back to QR Codes" to return to your Bitly Homepage. Repeat steps for generating new QR codes. If you need to make a change, just change the document, sheet, presentation, form, etc. OR whatever the destination is, and copy the new link and edit your current QR code URL with the new destination URL. That's it, no need to do anything with the QR code, it will automatically synch with the new information.