Undo/redo

Hi,
Is there any way to have an arrow button somehow displayed on top of Illustrator and photoshop of a REDO/UNDO button - instead of having to go to keyboard and click CTL Z?
(I work with a pen and hardly use my keyboard)

What tablet are you working on?
You can set shortcuts

cintiq 16

how should i set shortcut

You can do edit - undo/redo.
But I have a grid panel I created in the Wacom center which I set to look like this:


I usually pin it to the corner of my screen.

How did you go about creating this?