By default, when you select a formula or source field in a dialog box, Enter mode is activated. You can see this in the ...

To apply data validation rules to a selected cell or range, head to the "Data" tab on the ribbon, and click the top half of the "Data Validation" icon if you're using a wide screen, or the left half ...

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