You Can Fix It

To assign a password to a Word for Mac document, follow these steps:
Click the Word menu
Select Preferences
Click Security in the left side of the dialog box
Enter a password in the box labeled “password to open”
Click OK
Re-enter the password when prompted
Click OK

You can also require a password to modify the document:
In the security section, type a password in the box labeled “password to modify”
Click OK
Re-enter the password when prompted
Click OK

The Protect Document button allows you to safeguard tracked changes, comments, and forms. Simply select what you would like to protect and enter a password. Click OK. Reconfirm the password when prompted.