If you wish, you can create a user that allows you some advanced features. If you are logged on you can save extent that you wish to revisit. The selected layers and classes are also saved when saving an extent. This allows you to login and quickly zoom to an area that you were previously viewing.
Once you are logged on you will see the above window with you user name in the top. To save an extent, navigate to the location you wish and turn on all layers you want to see. Click on Create New Extent and enter the name you want the extent saved as. Once the extent is saved it will appear in the drop down list Select your extent. Now, whenever you are logged in you will be able to select the drop down list, choose the extent that you saved and the map will be drawn as it was when you saved your extent.
If you wish to change an existing extent choose the extent from the list, change the map how you want it, and then click Save Current Extent. You can also delete the current extent.
If you have set a username and forgotten the password, you may click on Log On, enter your username and select "Email Password." You will be emailed your password as long as you entered a valid email address when you created your user.