Logging in to WordPress is as simple as typing yoursitename.com/wp-admin in the address bar of your browser. The /wp-admin will take you to a page that looks like this.
Simply type in your username and your password, then click the log-in button. If you can’t remember or don’t know what your username or password is, you can click on the Lost your password? link below the log-in box. A new password will be sent to the email you signed up with. If this does not work or you can’t get to this page, refer to your site-specific documentation.