Install the KolorWeb Access Admin Notification plugin from WordPress repository and proceed with its activation.

Log out of wp-admin and log back into your WordPress site with your administrator account.

You should have received an email notification for the login you have just logged.

If you don’t receive it, please check your spam folder.
For better deliverability Make sure you are using an external smtp and that your email address is enabled to receive messages from your website.

I advise you to do some submission tests to be sure that everything works, and not to be caught unprepared in the unfortunate hypothesis that some malicious person enters your site and blocks it as soon as possible.

For any doubts or clarifications, open a ticket in the support forum.

I’ll be happy to help you!