You need to launch the Admin Panel by pointing your browser to your login file on your server. Open your browser and type in your URL to your login.php file.
i.e.: http://www.mysite.com/locator/admin/login.php
Of course, you need to replace the mysite.com above with your real domain.
How To Login:
Once you type in your URL, you should see the login page, where you are asked to login with your username and password.

If you can't remember your login info, then you can click on the 'Forgot Your Password' link to have an opportunity to have the system email you the login details. PHPMail must be installed for emails to work.

You will have a choice of entering your Username or Email to get your password. After entering your Username or Email Address into the box, just click the button to have the system search for your account. If one is found, an email will be dispatched to the email address of file, containing the username and password for logging in.

In the event that your license key code inside your database does not pass authentication, then you may see a login page that looks similar to the graphic below. If so, you will need to re-enter your license key code into the box, along with your username and password. You can get your license key code from within your Member's Account. Just view your license and copy/paste the key code.

You can also click on the 'License help can be found here' link to get a little bit more help about this error you are receiving.
Page url: http://www.helpandmanual.com/help/index.html?loggingin.htm