You should now see the page shown below:
In this example, there is a list of four files in the bottom half of the page. These are the sub-pages in this particular ePortfolio.
To choose which sub-page to make visible in your ePortfolio, e.g. 'My Research', click on the Edit Properties button on the right of it, as shown below. It is made up of four little squares. This will take you to the Properties menu for that page.