Global options concerning the Portfolio custom post type can be found under the "Portfolio" tab in the "Theme options" page.
A specific note has to be made about the "URL slug" options, which enables to customize the URL to Portfolio items.
For example if you’ve set up pretty permalinks, by default Portfolio items can be reached from a URL such as
If you set the "URL slug" to "portfolio", the resulting permalink for Portfolio items will be
Important: please note that you cannot use the same slug for portfolio items and the Portfolio page, as this would mess up various things, including the Portfolio pagination.
Remember to re-save the site’s permalinks upon changing the URL slug field.