After installing the plugin “Cosimo Portfolio”, you’ll see the “Portfolio” item in your WordPress Dashboard.
Thereafter go to “Pages” and click “Add New”.
Provide a name for this page “Ex: My Portfolio” and, in “Page Attributes” section choose the template “Portfolio Page”.
Here is a screenshot of example:
Save the page. This page will be the “portfolio main page”.
Now you can go on your WordPress Dashboard on “Portfolio-> Add New” and create your pages. Use portfolio categories for filtering.