If you want to create an animation with a complex path, it may be more efficient to record the path as you drag the layer rather than creating individual keyframes.
Make sure you have selected the layer; if the insertion point is in the layer, the layer is not selected. To select a layer, click the layer marker or the layer selection handle, or use the Layers panel. For more information, see Manipulating layers.
Dreamweaver adds an animation bar to the timeline, containing the appropriate number of keyframes.