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 data.

How to freeze a row in Excel so it always stays on the screen, even when you scroll away

You can freeze a row in Excel through the "Freeze Panes" menu. This lets you scroll through a spreadsheet without that frozen data leaving the screen.