Copy the keyframe created when you drew your path, and paste it further down the timeline; where you paste it will depend on how long you want your shape to take to go from the beginning to the end of the motion path.
Flash Tip: Motion Tweening Expanded: Motion Guides
By Adrien-Luc Sanders, About.com
On your Motion Guide layer, you’re going to draw a line. You can do this with the Pen Tool, the Line Tool, or the Brush Tool, though I’d recommend the Pen Tool for the smoothest line. This line is the path that your shape will follow.
Index: Flash Tip: Motion Tweening Expanded: Motion Guides
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