I need to know how to delete ringtones and how to

to delete ringtones, open the file explorer application from progams. navigate to device\my documents\ my ringtones , select the ones you want and delete. nice and ease. set a new ringtone either in the sound and notifications section of settings, or on a file, tap and hold on the screen on a file you wish to have as a ringtone and select "set a ringtone". if you are looking for these as a message tone you need to convert the file to a .wav file and import this to the windows folder on the device then select in the sounds and notifications tab in settings.

assigning tones to contacts can only be done if your contacts are outlook contacts, not sim contacts. open and edit a contact, scroll down to ringtone, although again with these i belive the file must be a .wav file and be located in the windows directory.