Hi,
OK...Click the top left corner cell (between 1 and A). This will highlight EVERYTHING (alternately, you can just highlight all cells being used, whichever is easier). Right-click and go to Format Cells, Protection, and uncheck the Locked box. Then, go to Tools, Protection, Protect Sheet. From here, you should have an option of using a password to unprotect the sheet. You should also have a list of check boxes that specify what a person can do to an Unlocked cell. You can specify that they can only Select an Unlocked Cell. This will let them do data entry, but nothing else. Now, fair warning, by unlocking everything, they'll be able to edit or erase your formulas. Again, the safe thing is to only unlock the cells where people will be doing data entry. Good luck!
Rawley