The login page for all default WordPress sites is http://yourdomain.com/wp-login.php

Here is the login process in detail

In your browser’s address bar type your domain name followed by /wp-login.php

You should then see the default WordPress login page

Complete the username and password fields

If you wish to remain logged into this WordPress website for future visits check the “Remember Me” check-box

Click Login.  A successful login will redirect you to the WordPress dashboard screen