Your Chromebook saves network information when you connect to a network. To delete that info:

  1. Sign in to the Chromebook with the account designated as the owner.
  2. Click your account photo.
  3. Click Settings Settings.
  4. In the "Network" section, click Wi-Fi.
  5. Click Known networks.
  6. Find the network you want to forget, then click More More and then Forget.