Deleting Memory Locations
To delete a Memory Location, do one of the following:

Select the Memory Location and choose
Delete Memory Location from the Memory Locations Window menu.

In the Memory Locations window, Option-click (Mac) or Alt-click (Windows) the Memory Location.
To delete all Memory Locations, do one of the following:

Choose
Delete All from the Memory Locations Window menu.

Option-Shift-click (Mac) or Alt-Shift-click (Windows) any Memory Location in the Memory Locations window.
To delete a Marker from the Markers ruler:

Option-click (Mac) or Alt-click (Windows) the Marker.