If you're not familiar to using computers...
Some of the terminology we take for granted can be confusing for others who have little experience of using computers.
So it's easy for us to say 'click here' and 'move your mouse there'.
But if you're new to this computer stuff and don't understand 'clicking the navigation buttons':
When we refer to 'mouse cursor' we mean the little white arrow on the screen
You can move this cursor around the screen by moving the mouse
When we say 'go to' or 'move you mouse cursor' we mean move your mouse to move the mouse cursor on the screen
When we say 'click on' or 'click' we mean 'press' the left button on your mouse.
So, let's try...
1) Move your mouse cursor (arrow on the screen)
2) To one of the navigation buttons (Home : About : Contact) at the top of this page
3) Click the left mouse button to select that option
4) The new page will open