Once you have chosen your images, theme and published, you will be taken to your Portfolio Editor where to can really make things your own.
When you're ready to make changes to your Portfolio public, always make sure that you SAVE and PUBLISH! You can manage the photos in your Portfolio on a daily basis through your Photo Manager. You can access this page directly from your Portfolio by selecting the "Organize Photos" option on the top left hand side.
For a step-by-step look at getting started with Portfolios, feel free to watch this video tutorial!