Before creating a portfolio page, you need to make sure that you had already created some projects under Portfolio section.
In order to create a portfolio page, you should follow the next steps:

-Portfolio style: lets you choose layout style for the page. Each style has additional options, that appear after selection. - Order: lets you display projects in ascending or descending order. If you keep Default option, the setting will be applied from Theme settings. - Order posts by: lets you choose order type of the items - by date, title etc... - Categories: you can select which portfolio categories to show on page. - Exclude selected: if enabled, the selected categories will be excluded from display. - Items per page: you may decide how many items will be displayed per page.