Start the Flash program. Click "New" from the File menu on the main Flash menu bar. Click the file type "Flash File (ActionScript 3.0)" from the New Document dialog box that appears. Click the "OK" button to close this dialog box.
Click on the Window menu option on the main Flash menu and click the "Drawing Tools" option to display the drawing toolbar.
Click the Window menu on the main Flash menu bar and click the "Timeline" option to display the timeline in the Flash document.
Click your left mouse button to select frame 5 on the timeline. Click the "Timeline" menu option from the Insert menu and click the "KeyFrame" option to select frame 5 as the beginning of a new frame sequence.
Click the rectangle tool on the drawing toolbar. Position your mouse cursor over the stage and then depress your left mouse button to set one vertex of the rectangle. Keeping the left mouse button held down, drag your mouse to establish the position of the opposite vertex of the rectangle. Release the left mouse button to set the position of this vertex and place the rectangle on the stage.
Click the "selection" tool on the drawing tool bar (the one with the black arrow on it) and then position your mouse cursor on the stage, but outside of the boundary of the rectangle you drew. Depress and hold down your left mouse button and then drag your mouse so that a selection box completely surrounds the rectangle.
Click the "Convert to Symbol" option in the Modify menu on the Flash main menu bar to convert the rectangle to a movie clip. Click the "OK" option in the dialog box that appears.
Click your left mouse button to select the frame 75 on the timeline. Click the "KeyFrame" option in the Timeline menu located in the Insert menu to set frame 75 as the starting point for the next frame sequence (which will make frame 74 the end point for the frame sequence that began on frame 5).
Position your mouse cursor over frame 74 (not frame 75) and click your right mouse button to display the context menu. Click the "Create Motion Tween" option to set a motion tween between frames 5 and 74.
Click the "selection tool" and use it to select and drag the rectangle to a new position on the stage. Observe that a dotted line representing the motion path appears between the position of the rectangle in frame 5 to the position of the rectangle in frame 74.
Click the "TestMovie" option in the Control menu on the main Flash menu bar to play the movie and watch the rectangle move between the two positions following the trajectory of the motion path line.