Practice left-clicking by playing tic tac toe. Click on a square to make an "X". The computer will enter the "O"'s.
When the game is over, a "Pop-up" window will appear. Click on the OK button.
When you click with the right mouse button, a pop-up menu will appear. This menu is different in different software applications.
Try it now. You should see a menu pop up, similar to the one pictured here:
Left
Click somewhere outside of the menu to make it disappear.
Now, Left click on the circle, to continue...