How to switch to OnKey with the globe key
The globe key is how iOS switches between keyboards. OnKey uses it like any other keyboard.
Steps
Tap a text field. Open any app and tap where you type, so your current keyboard appears.
Hold the globe key. Press and hold the globe key at the bottom of the keyboard.
Pick OnKey. Choose OnKey from the list. The OnKey strip appears with its actions.
Switch back whenever you like. Hold the globe key again and pick your other keyboard.
Questions
There is no globe key.
iOS shows the globe key only when more than one keyboard is on. Add OnKey first, then the globe key appears.
Can I tap instead of hold?
Tapping the globe key cycles through your keyboards. Holding shows the list so you can pick one.