After you have your ring tones downloaded: For Gmail go into the main settings for the phone, sounds, notification ringtone to pick your notification for gmail. For texts go into the messaging app itself and hit menu button, settings, scroll down to notification settings, select ringtone and select your ringtone. For Calendar and voicemail you would follow the same way you set up texts by going into those apps and within the settings select your ringtone. Hope this helps.