How do you move icons to very bottom of home screen

On an iPhone the maximum is 4, so first you need to move one back up out of the dock:

> First, hold your finger on one of your dock apps and then drag it up to the home screen

> Next, hold your finger on the app you want to move to the dock and drag it to the dock

> Tap “Done” at top right

If you mean moving more than one icon to the dock of your iPhone; you can't.

The max is 4.

On an iPad you can.