Please follow this guide on how to add bar/QR codes:

1. Create or open an existing design.
2. Click on the "Elements" menu from the sidebar. 
3. Click on the "Bar/QR-Code" button.
4. Paste your preferred website URL into the input box. 
5. Either click on the “Create QRCode” or “Create Barcode” button to add the code to the canvas.