First you need to go to Server Manager, expand "Roles", right-click "web server" and choose "add role services".

Then under "security" choose "basic authentication".

Last, set up a local user: go to Server Manager, expand "configuration"->"local users and groups". Right-click "users" and click "new user...". Set up a user/password.

Voila, now user the user/password you've set up when browsing to your website.

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