Wait to run code until confirmed with button click?

I basically have a function that I need to run, but I don't want this function to actually run until the user clicks a UI button on the screen that says "Ok", to confirm that the user is ok with going through with the action. How would I do this?

 

You run the function you want from whatever function you set in the Ok button's OnClick event.

https://docs.unity3d.com/Manual/script-Button.html

 

There is a great tutorial section on the Learn tab of Unity's site. https://unity3d.com/learn/tutorials

Here is a tutorial that shows you how to use clickable UI buttons: https://unity3d.com/learn/tutorials/topics/user-interface-ui/ui-button?playlist=17111

If you can't figure out how to do what they're doing in that tutorial, you might want to do the Canvas tutorial first: https://unity3d.com/learn/tutorials/topics/user-interface-ui/ui-canvas?playlist=17111