Question: how to set a custom ringtone on iphone from youtube?
Answer: Step 1: Go to Video on YouTube. ... 
Step 2: Copy Link and Paste Into Mp3 Converter (e.g. Youtube-mp3.org) ... 
Step 3: Download Mp3 Into ITunes. ... 
Step 4: Open ITunes and Right-click on New Mp3 File. ... 
Step 5: In Drop-down Menu, Click “Get Info” ... 
Step 6: Go to “Options” and Edit Start and Stop Times to Fit Ringtone Length.