The steps for downloading cool dog music in this car are as follows:

1. On the main screen of BYD Qin, find the "App Store" icon and click Open.

2. Enter "Cool Dog Music" in the search bar of the app store, and then click the search button.

3. Find the cool dog music application in the search results, and click Download and Install.

4. After downloading in the app store, you can open the cool dog music in the app store, or find the cool dog music icon on BYD Qin's main screen and click Open.