I cannot find the setting for my AirPods on my iPhone

Hello,

See this:

1. Place the connected AirPods in your ears and have the cover of the charging case open
2. Go to Settings > Bluetooth and select the circled “i” next to your AirPods 
3. Change the name or anything else on the screen
4. For more detail: Adjust the settings of your AirPods  

Good luck.