@Abdo71, firstly, this is an English speaking forum, so please post in English. that way more people will be able to understand you and help you with issues you're facing.
if I understand correctly, you want to use a song on your phone as your ringtone. to do that, go to Settings > Sound > Phone ringtone and tap the + icon in the top right corner. it will open Sony Music app, from which you can choose any song you want to set as ringtone.
