Creating A Horizontal Position Tween

How to create a horizontal position tween:

In the main timeline insert a keyframe at at frame 24.
Select frame 24 in the main timeline then select the movieclip on the stage area and drag it across to the right.
In the main timeline, right click between frames 1 and 24 and select "Create Motion Tween".
Then in the main menu go to Control > Play to play your animation.

Note: Make sure the object you want to animate has been converted to a graphic or movie clip symbol before trying to create a tween.