By default, all the modules are placed into the room "Unplaced products", unless you placed them during the installation (iOS with HomeKit).
- Go to Settings > Manage my Home
- Select the room where the module is and click on the module
- On the module page, click on the 3 dots on the top-right corner and select "Move"
- From there, choose an existing room or create a new room by clicking on “+ Add a room”, select a name, a room type and click “Next”
- The module is now placed in the desired room
Please find a video tutorial here below :