Can someone explain how to find my iPhone from another iPhone?

I misplaced my iPhone somewhere in the house and only have access to another iPhone right now. I think I had location services on but I’m not sure if it’s linked to the same account. What’s the exact way to locate it (and make it ring) from the other phone, and what if it’s offline?

Use the Find My app, log in with your Apple ID. If offline, enable “Notify me when found.” Make sure your iPhone is signed into the same Apple ID.