I just got my first mac several weeks ago and am having trouble when trying to save files in Adobe Photoshop. When I click save it asks me if I want to write over the original file. There are two options: "Cancel" and "replace." The default option is set to cancel. I am not able to "tab" or "arrow" over to choose replace. Yes, I can bring my hand to the mouse and click replace but isn't there a keyboard shortcut for this? I attached a screenshot in case in might better illustrate what I am trying to describe. Thanks!