How do I move icons around on my iPhone 7?

All you have to do is press down on the icon and hold your finger there for like 3 seconds until the application starts to wiggle and then just move it around however you want and one you get it where you want it, just click the home button to make it stop.

Press and hold an icon until all the icons wiggle. Do not press too hard. Then drag the icon(s) where you would like. Click the home button to end the wiggling.

Help here > Arrange the apps on your iPhone, iPad, or iPod touch - Apple Support

See this article:

Arrange the apps on your iPhone, iPad, or iPod touch - Apple Support

Don't push too hard! Doing so invokes force touch.

Glad that helped. Enjoy your iPhone 7!

Thanks!