Cannot edit drop down menus

I have a spreadsheet (attached) designed to calculate the savings a customer can make by using our energy saving lights compared to their existing lights. We have upgraded our range, and I would like to introduce some options which reflect this.

However, the drop down menus incorporating this information seem to be locked in some way, and I cannot access or modify the formulas or data that they refer to.

You will see that the first menu includes the kinds of lights that the customer already has, and the one below has details of our lights. The titles for the menus are located in cells X7 and onwards. But as I say, the formulas remain elusive. How can I reach them? Thank you for your time.

The dropdowns are activex controls.
First display the Control Toolbox toolbar.
Go into Design mode, ruler/pencil/triangle icon.

You can now select the dropdown and right click. Pick Properties and adjust the ListFillRange property.

In design mode( Visual Basics ToolBar), right click on the control and select Properties,
adjust the list fill range there.

The formula is in the Combo-box change code, right click on the sheet tab and select View code,.
Are you able to talk to the person that actually made the workbook?

you have some hidden sheets format/sheets/unhide