Go to your domain (your website homepage), and add /admin
So it should look like:
Enter your username and password that was provided to you in your Essential Information Access Document. If you need to create a new account or have lost this information, please submit a Help Desk ticket for the log in credentials. You can also reset your password at the log in page.
The screen should look like the one below:
Once you enter your username and password and hit "Submit" you will be in your Administration Panel, which should look like the screen shot below: