1. First, open the music broadcast screen application and make sure that the mobile device and the large-screen terminal are connected to the same Wi-Fi network.

2. Then, in the music broadcast screen projection application, select the device to project, and make sure that the device is connected.

3. Then on the screen projection device, open the video or application to be projected, and ensure that the video or application supports the slow motion function.

4. Then, on the screen projection device, pause the video or application and select the "slow motion" option.

5. Finally, in Laibo's screen projection application, select "Start screen projection" and wait for the screen projection to complete.