Go to File > Info > Protect Workbook > Encrypt with Password
Input a password, it will ask you to retype it then select OK or press the Enter key on your keyboard.
Once password protected it will show this.
When you open the document the next time it will look like the below, before you can access it.
Please make note of the password, as if you lose the password. There is NO WAY of getting into that document.
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