Hello @Lebonguy ,

Welcome to our community.

According to Google Translate, your question is that you want to change password of your modem. If there is any discrepancy, please describe it in English.

May I know the model number of your device? Please refer to

How to find the model number of your TP-Link device

How to find the hardware version on a TP-Link device

If you'd like to change the password on your DSL modem router. Here's how you can do it:

Method One: Using the Web Management Page (All models)
1. Connect a device to the router via Wi-Fi or Ethernet.
2. Open a browser, enter http://tplinkmodem.net, and log in with your current password.
3. Go to Advanced > System Tools > Administration, enter the old password, set the new password, and click Save.

Method Two: Using the Tether App
1. Connect your phone to the router's Wi-Fi. If the router is bound to your TP-Link ID, you can manage it remotely.
2. Tap More > System > Manage Password (or Tools > System > Login Account), verify the current password, enter a new password, then tap Save/Done.

Notes:
• After changing your password, use the new password to log in to your router.
• Avoid default passwords like "admin." Use a mix of uppercase letters, numbers, and symbols (e.g., SecureR0uter!2024).
• If you've forgotten your current password, you can log in with your TP-Link ID or perform a factory reset. For reset instructions, refer to: What can I do if I forget the administrator password of my xDSL modem router?

For more details, you can also visit: How to Change Your TP-Link Device Admin Password