When navigating through the NAPT Portal, across the top is a list of modules which are available to the user who is logged in. This is seen in the image below in the red highlighted box. When you select a module, you will see an orange line that appears below the name to indicate that you are currently viewing this page.
If there is additional navigation within the module, that will appear on the left-hand side of the page. This is seen in the image below in the yellow highlighted box.