In game pop up messages

Is there a way to display a message with an OK button that must be pressed in order to continue with the game?
I was hoping to make the pop messages in the style that iOS does, I'm sure you know what I mean.
I was hoping to make the pop messages in the style that iOS does, I'm sure you know what I mean.
Comments
Still new at this, so thanks for your help
But when I then press the OK button I have, it changes scene and goes back to the game as I want, but it resets everything, is there an easy way to get it to return the the current game state before the pause menu came up?