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This option is located between Print and Send. Clicking this button will open a menu that will allow you to save your document or start a new one.
This is the round button that is located in the top-left corner of the window.
There will be a password in the box, delete it and press OK. Click Protect Document and select “Encrypt with Password”. If you want to remove your password, open the document and click the File menu again.
In order for the password to take effect, you must save the file. You will not be able to retrieve this password if you forget it, so write it down in a safe location. You will be asked to enter the password again to confirm it. Click “Encrypt with Password” in the menu that appears. This square button is located under the “Information about ” section. If the Info tab doesn’t automatically open, click the Info tab. Click the "File" in the upper-left corner.
If that’s the case, you’ll get a special box to check when you’re adding a password to your document. If you have a Touch ID–enabled Mac, then you can use your fingerprint to unlock your file instead of having to type in the password. Opening Password Protected Documents with Touch ID
Once you have your file password protected, you’ll be able to distinguish it from your other Pages documents as its icon will change to a picture of a closed padlock. Click “Set Password” on the box, and you’re all done! Assuming you didn’t save the password to your keychain, you’ll be required to type it in afterwards when you want to access your file. In the “Require a password to open this document” dialog box that appears, type in the password you want to use twice, then add a hint if you want to. If you check the “Remember this password in my keychain” box shown below, you won’t have to enter the password every time you open the file-but neither will anyone else who uses your Mac! So be careful if your purpose is to prevent people using your Mac from seeing the contents of that document.