1. Open the Lucca picture book reader, find the "Settings" option at the bottom of the main page, and click.

2. After entering the settings page, find the "Registration/Cancellation" option and click Enter.

3. On the registration/cancellation page, select "Cancel current account".

4. After successful logout, return to the main page and click "Settings" again.

5. On the Settings page, locate and click Accounts and Security.

6. Click the "Login" button to enter the login page, and enter your mobile phone number and password to log in.

7. After successful login, you will be prompted whether to bind this account to the current device.

8. Click "Yes", then connect the mobile phone to the Wi-Fi hotspot of Luca picture book reader, and enter the Wi-Fi password to complete the device connection.

9. The system will automatically bind your account to the device.