Go to Assets tab

Select Asset to attach QR/Barcode

Click Edit in top right corner

Select Assign in QR/Barcode field

Choose Input Code Manually, Generate Code, or Scan Code

Click Done in top right corner

Click Update in top right corner

Go to Assets tab

Select Asset to attach QR/Barcode

Click Edit in top right corner

Select Generate code or input QR/Barcode manually

Click Update in bottom right corner