Blockstream Jade has a unlock feature called QR PIN unlock. First I enter my previously selected PIN numbers. Next is the part I don't understand its purpose I go to a webpage then I take QR pictures back and forth between Jade and website. Once I entered the PIN numbers on Jade, anybody with a phone can do the next part, right?
QR PIN unlock is just a feature that allows you to unhook your wallet in fully air-gapped way. It is the safer (in some extend) procedure than doing similar action let's say via USB or Bluetooth. The step-by-step guide (accompanied by the relevant pictures) on how to utilize "QR PIN unlock" can be found on their supporting page
https://help.blockstream.com/hc/en-us/articles/15572026940953-How-do-I-access-my-wallet-with-QR-PIN-Unlock