When you right click a cell containing an XLCubed formula, the right-click menu for XLCubed should appear.

The most common causes for the menu not appearing are

1. There may be another calculation applies like *-1 or a - in front. Remove the additional calculation.
   
   
2. The spread sheet view needs to be in "Normal" mode.
   
   
   
   If its in Page Break View (as per image) then then menu will not appear.