Hi
o.k. a step-by-step list

- first copy all 3 procedures in a module of your workbook. To get to
this module do the following:
-> open your workbook
-> Press ALT+F11
-> Insert a new module in your workbook and paste the code in this
new module
-> close the VBA editor, save the workbook
- After this run the 'Add_Item' macro (e.g. via 'Tools- Macro -
Macros')
- Now if you right-click with your mouse in any of your cells in a
worksheet you should see the entry 'Calculate' in this context menu 8at
the bottom of this context menu)
Note: To remove this entry simply start the 'Delete_Item' macro