Editing head motion is quite different from other features in that the beginning portion of the subsequent head motion will drastically change in response to a modification in the immediate head motion section prior to it. This is also in effect when deleting specific sections. Just keep in mind that any section you edit, you are setting the final head position. If the subsequent head motion section is altered, the final position of a given head motion will remain the same no matter how the beginning of the section is affected or is altered by the previous head motion.
Click on a head motion twice to call up the editing dialog box (go to #2) or once and right click on it to Edit, Delete, or Remove All.
If you choose Edit, the dialog box will appear. After you have finished your selection, click OK.
You may also go through the menu HAP > Edit Selected > Head Motion. After you have adjusted it, click OK.