Whether the mouse is the type that is  plugged into a PC or laptop like this:		Or a touchpad type that is built directly  into the laptop like this:

It will always have two buttons - a LEFT BUTTON and a RIGHT BUTTON - everything you do in these
exercises will be with the LEFT BUTTON - BUT PLEASE - DO NOT CLICK THE BUTTON YET !
When you move the mouse around the screen it will either look like an arrow - like this
Or it will look like a little hand with a finger indicating that you should click something - like this

Move the mouse around the screen and see how the mouse pointer changes from an arrow to a hand.  

You should see that it only becomes a hand when you move over the pictures and when it does click the LEFT BUTTON