How to lock cells in Microsoft Excel, so you need a password to change or erase data

You can lock cells in Excel by heading into the program's "Protection" tab. There, you can set a password, and protect your ...
Houston Chronicle

How to Make a Field Mandatory in an Excel Spreadsheet

You may want to create mandatory fields in your Excel spreadsheet -- fields that must be filled in before you can save the document. When a field is made mandatory, there is no risk of leaving out ...