Hey coke4bill,
Welcome to the Apple Support Communities! It sounds like you're running into an issue with charging an iPhone wirelessly. I'd be glad to look into this in more detail with you.
You mentioned buying iPhones but not which model of iPhone. Are they they same model exactly, or do they differ a bit? This might be important because if they're not the same model, one could support wireless charging where the other doesn't. Also, there's not a setting that you enable for wirelessly charging your iPhone. It just needs to be placed on a Qi-certified charger to begin the process. Check out this page to ensure that both of your iPhone's meet the requirements for wireless charging and for a few tips in the "Learn more" section.
How to wirelessly charge your iPhone
Have a great day.