1. Log in to the router: Enter the Ruijie router’s management interface address in the browser, then enter the administrator username and password to log in to the router’s management interface.

2. Enter the firewall settings: In the router management interface, find and click "Network Settings" or "Advanced Settings" and other related options to enter the router's firewall settings page.

3. Add filtering rules: In the firewall settings page, find related options such as application filtering or port filtering. A new filter rule needs to be added.

4. Set filtering rules: When creating a new filtering rule, choose to filter on a specific port of Kugou Music, or filter based on the target IP address. Obtain the required port or IP information from the official website of Kugou Music or related technical support.

5. Save settings: After completing the settings of filtering rules, remember to save the settings and restart the router to make the settings take effect.