To set a "password to modify," set the WritePassword property of the Workbook object.

 
Sub passWrite()
    ActiveWorkbook.WritePassword = "pass"
End Sub

1.	Get current active workbook full name
2.	Opens a workbook named MyWorkbook.xls located in the same directory as the active workbook. An error is generated if the file cannot be found.
3.	Saving Worksheets as Web Pages
4.	Previewing a workbook before saving it as a Web page
5.	For Each-Next is useful for cycling through each member of a collection
6.	Saves the worksheet range "$A$1:$B$11" as a Web page without interactivity so that it can be viewed in any current browser:
7.	Looping through a Collection: use the For Each- Next structure
8.	Closes the active workbook without saving changes
9.	Protects the structure and windows of the active workbook with the password 0llsecurd:
10.	Working with the ActiveWorkbook Object
11.	Printing a Worksheet
12.	Setting Excel to Remove Personal Information from the File Properties When You Save
13.	Setting Passwords and Read-Only Recommendation for a Workbook
14.	Opening a New Window on a Workbook
15.	Programmatically Retrieving Link Source Information
16.	Standard Workbook Properties

To set a "password to modify," set the WritePassword property of the Workbook object. : ActiveWorkbook « Excel « VBA / Excel / Access / Word