Hi  @Cecila2025,

According to the translation of Google Translate, I think that your question is to set up RE305. If there is any discrepancy, please describe it in English.

TP-Link range extender works with almost any Wi-Fi router and is easy to install. There are three ways to connect the TP-Link Range Extender to a router. Before you start, please power on the extender next to the router:

1. Via the WPS button, there is a physical WPS button on the Range Extender. Press the WPS button on the Router, and the Range Extender in turn. The Range Extender will connect to the Router automatically within 2 minutes. If the router doesn't have a WPS button, you may try the other two methods instead. For detailed instructions, please refer to:Configure my Range Extender via WPS button

Alternatively, here is a full setup video for your reference: How to set up a TP-Link Range Extender

2. Via the Tether APP. The Tether APP can be downloaded from the APP Store or Google Play Store. In the Tether APP, click the "+" button in the upper right corner, select "Range Extender" and the Tether APP will guide you through the setup process. This is a step-by-step FAQ that contains more details: Configure Range Extender via Tether APP

3. Via a web browser, the Range Extender has a web management interface available. Please connect your PC/phone to the Range Extender's default Wi-Fi "TP-Link_Extender_XXXX", open the browser and access http://tplinkrepeater.net or http://192.168.0.254, follow the quick setup procedures to set up your Range Extender. This FAQ provides detailed instructions through the web interface: configure my range extender via web GUI

After the 2.4G/5G/Signal light is on, you may simply unplug the extender and plug it into a power socket halfway between your router and the area where you need better coverage. Kindly ensure it’s within the range of your router’s Wi-Fi signal.

If you have 2 or more extenders, just repeat the setup process and connect the other extenders to the router's Wi-Fi.