The steps are as follows:

1. Open the NetEase Cloud Music app, log in to your account, and find your favorite songs on the homepage or "My Music" page.

2. On the right side of the song, you will see a " " button, click it, and select the "Add to Playlist" option in the pop-up menu.

3. The playlist has been created, directly select the existing playlist to add songs. If you haven't created a playlist yet, select "New Playlist" and give the playlist a name.

4. Click OK, and the song will be added to the selected playlist.