how to create a custom message that’s displayed before anyone can sign in to your Windows 10 laptop/desktop/tablet. One of many reasons you may want to do this is so that you can include information about how to return your laptop or tablet if it’s lost or stolen 
https://windows101tricks.com/display-a-custom-message-on-windows-10-login-screen/
To display a custom message on the Windows login screen using the Registry, press “Win + R,” type regedit and press the Enter button.

navigate to the following key.

HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/Current Version/Policies/System/

On the right pane find the value “legalnoticecaption,” right-click on it and then select “Modify.”
. Under the “Value Data” field, enter the message title and click on the “Ok” button to save the changes.
find the “legalnoticetext” key, right-click on it and then select the option “Modify.” In the Edit String window, enter your message text under the Value Data field and then click on the “Ok” button to save the modifications.

Once you are done with the changes, 

restart the system you will see a message when you try to log in to your Windows machine.


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