Touch and hold an empty area on the Home Screen until the apps jiggle
Tap the plus icon in the top-left corner
Browse or search for a widget
Tap the widget you want
Swipe to choose a size if available
Tap Add Widget
Drag the widget to the desired spot on the Home Screen
Tap Done
To add widgets to the Today View, swipe right on the Home Screen, then touch and hold, tap the plus icon, choose a widget, and tap Add Widget