Q&A for How to Set Ringtones on an iPhone

There's a switch on the left side of the phone that silences and puts the ringer on, if it is orange it is set to silent, toggle it back to the other position.

There are apps you can download with libraries from which you can choose. Some let you use downloaded music.

You can't set an actual video as a ringtone, but if you want the audio from that video, download it onto your PC and convert it into an MP3 file. Then, follow the standard steps for converting an MP3 into an MP4 through iTunes.

Go to the clock app, set your time, and it will have a column that says "songs"; go to that and pick your song.

You can buy one or download one onto another device (ex. a laptop) and then send the file to the phone. Plug the phone into the laptop and open the file explorer. Be sure that your phone is unlocked while you do this. Drag the ringtone file from your laptop's files to the phone's directory and it should appear in your audio files.