How to set wp8 custom ringtone?

Step 1: On the standby page, click Application.

Step 2: Click on the music player.

Step 3: Press and hold the music you want to set as ringtone, and select Set as.

Step 4: If you want to set the ringtone of all contacts, select the ringtone of mobile phone, and if you want to set the ringtone of a contact, select the ringtone of incoming call.

After completing the above operations, the ringtone is set.