A new window will open. C5D5E2 Click E2 in the formula to place the curser between E and 2. Next lock all formula cells.
Check the Locked option.
Click Protection and unchecked the Locked option. To do that choose the whole sheet right click and then select Format Cells then Protection then uncheck the Locked option and click okay. And a Format Cells dialog box will pop out. Most Excel users figure out how to lock these references by either toggling through the options with the F4 key or using the dollar sign symbol in front of the column andor row references.