Hello @JeampierGuan ,

Welcome to our community.

According to Google Translate, your question is that you failed to enter the WiFi password. If there is any discrepancy, please describe it in English. Here's what you can do:
1. Confirm the correct wireless password
First, make sure you know the correct WiFi password for your router. 
For more guidance on verifying your password, check out: How to remove existing wireless network profile on Android&iPhone

2. Reset and reconfigure the extender
Since the password input failed, you'll need to start the setup process again:
• Reset the extender by pressing the reset button with a pin for about 1 second until the LEDs flash
• Open the Tether app on your phone
• Click "Add" and follow the onscreen setup instructions
• When prompted, carefully enter your router's WiFi password

Best Regards.