Open the Word document
Click File
Click Info
Click Protect Document
Select Encrypt with Password
Enter a password
Click OK
Re-enter the password
Click OK
Save the document
Close and reopen the document to confirm the password prompt
Open the Word document
Click File
Click Info
Click Protect Document
Select Encrypt with Password
Enter a password
Click OK
Re-enter the password
Click OK
Save the document
Close and reopen the document to confirm the password prompt