Hey folks! Thanks in advance for any help. I'm a beginning Excel user and teacher looking to create a self-grading mouse test for my computer lab students. I just need to be able to have text appear on double clicking a button. I had no problem doing the single click button. I just need a little help changing the activation setting to double click. Here's how what I need to do looks like without the Double Click:

Sub Macro3()
Range("E21").Select
ActiveCell.FormulaR1C1 = "Correct!"
End Sub

Super easy, but stumped me with only the help files to work from. I'd also love any explanations of the concepts involved so I can repeat this process in similar situations. Thanks again.