Not a stupid question at all. Without knowing which phone you have (because the instructions could vary), if the music file is already on your phone, do you know how to navigate to where the file is located? If not, post back and include which phone you have. If you do know how to get to the music file, long-press it and you should get a pop-up with choices that include copy. Press Copy and you should then have a choice for Device Storage. Press that and you should then see all the folders in your internal storage. Scroll to the Notifications folder and press it. You then should have a Paste or Paste Here button, probably in the upper right-hand corner. Press that and the file should be copied.
If the music file isn't on the phone, connect your phone to your computer via the USB cable, allow the drivers to load, and then copy the files from your computer to your phone. If you want to use the music as a ringtone, put copies in the Ringtone folder of your phone's internal storage and likewise put copies in the Alarms folder if you want to use them as alarms. If you want to use them for music, put them in a Music folder on your external SD card if your phone has one; otherwise, the Music folder is also on the phone's internal storage.
Post back if you have further questions or need more detailed instructions. Welcome to the world of smartphones!
