Create a new macro in a general module. Name it auto_open:

Option Explicit
Sub Auto_Open()
activesheet.protect
End Sub

If you're new to macros:

Debra Dalgleish has some notes how to implement macros he
http://www.contextures.com/xlvba01.html

David McRitchie has an intro to macros:
http://www.mvps.org/dmcritchie/excel/getstarted.htm

Ron de Bruin's intro to macros:
http://www.rondebruin.nl/code.htm

(General, Regular and Standard modules all describe the same thing.)

Munchkin wrote:

Hello - I want this simple macro to automatically run everytime my document
is opened, but I'm not sure how to do that. Can you help? Thanks.

Activesheet.Protect

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Dave Peterson