In 6.0, navigate to:

            Settings>Appliance Updates

            Or, if you have organizations enabled:

            System>Settings>Appliance Updates

For 5.5 and below, navigate to:

            Settings>Server Maintenance

            Or, if you have organizations enabled:

            System>K1000 Settings>Server Maintenance


Once there, look for "License Information" Click the gold question mark box next to the partially hidden license key. This will give you the current node count and what components you are licensed for.