The process of deleting one or more bump spots is always done using an option from the Edit menu. To delete a single spot, select the spot on the bump list, then select the Edit menu, and the Delete Selected Bumped Spot option.
The above method may sound tedious. However, here ia a quicker method done entirely from the keyboard. Press ALT+B to select the bump list if you have not done so already. Scroll to the spot you want to delete. Now press ALT+E, which will open the Edit menu. Press S to delete the spot. This method is the fastest if you are selecting and deleting single spots from the bump list.
Every time you delete a spot, you will be asked to confirm your choice. The Yes button is the default answer so you can just press ENTER to delete the spot.
Use the Delete Bumped Spots dialog on the Edit menu if you want to remove a group of bump spots.