1. Upload the cool dog music from Apple mobile phone to cloud hosting, log in to the cool dog music on the computer, download the music from cloud hosting to the computer, and intercept the ringtone with the "cool dog ringtone making expert".

2. connect the apple mobile phone to the computer with a data cable, and download iTunes and iTools software from the computer.

3. Open Apple's mobile phone "Application Rabbit" software, connect to the computer, select "Trust" in the prompt box, open the computer's iTools software, turn off "iTunes Automation", press the Music tab, press "System ringtone" on the left, press "Import" or drag the ringtone directly to the window.

open itunes, select file-add file to the library in the menu bar, select the song for ringtone, click open, and the song will appear in the music of the library. right-click the song, select show profile, select options and fill in the start time and stop time (within 4 seconds). However, for files with a duration of less than 4 seconds, right-click the newly created song, select "Display in windows Explorer", change the format of "m4a" to "m4r", and select "Yes" in the pop-up window to change the suffix to m4r. After that, you need to double-click the renamed ringtone file. Check it by adding it to the ringtone in the library: in the itunes menu bar, Edit, find Preferences, put a tick in front of ringtone in Common-Source, and then "OK" to see ringtone in the library. Turn on ringtone to see if your file has been turned into ringtone and then check it in the library. Select "All Ringtones" or "Selected Ringtones", and then select "Synchronize" to successfully synchronize the "Ringtones". After that, the ringtone will appear in the Settings-Sounds-Ringtones-Customize of the mobile phone. To use this ringtone, just select it. The Custom option is above the Standard option.