To add ringtones to the Deep Blue Music ringtone system, including setting custom ringtones or adding new ringtone audio files, you can follow the steps below:

1. Open Deep Blue Music Ringtone system application and enter its main interface.

2. In the main interface, look for options such as Settings or Personal Center, which will generally be found in the bottom navigation bar or side menu bar.

3. After entering the settings or personal center, look for the ringtone setting option.

4. In the ringtone settings option, you can choose to add a custom ringtone or import a new ringtone audio file. The specific operations may vary depending on the application. You can select the appropriate option and follow the prompts.

5. If you choose to add a custom ringtone, you can use the audio recording function provided by the application or select an existing audio file in the local storage and set it as the ringtone.

6. If you choose to import a new ringtone audio file, you can browse the local storage, select the appropriate audio file to import into the ringtone system, and make corresponding settings.

Please note that the above steps are general operation procedures, and the specific operations may vary depending on the version and interface design of the Deep Blue Music Ringtone System application. It is recommended that you refer to the application's user manual, official website, or contact the application developer for detailed and accurate operating instructions.