You have to start from adding new tags in component, without them you won't be able to add new items. Add at least one new Tag. The same tag can be applied to many different items across the portfolio.

Each new tag has its own name and alias. If you add one or more tags you can start to add new items.

You have to fill all fields marked with *: title, image, description, and tags.

• Alias - the Alias is used in creating the URL (website address) for the detail page. By default, the component will use the Title for creating the alias (with modifications) unless you type an Alias in yourself. Joomla will make the alias all lower case, replace spaces with dashes and take out any characters that can not be accepted.
• Image - About choosing an image for item, you can use those which you have or upload a new one. We recommended image size: 1170px X 800px, but of course, if you have only smaller you can also use them.
• Thumbnail - you can choose a thumbnail image instead of using automatically thumbnail generated.
• Video URL - Portfolio items can contain not only images but also Youtube or Vimeo video clip. Just insert your video URL. Leave this field blank if the video is not required.
• Description - in this field you can add a description or even additional images that will be displayed on the item detail page under the main image.
  
• Tags - all items are based on Tags system, which is similar to categories. Once you get to three letters you will start to see suggested tags that already exist. The advantage of this solution is that each item can be assigned to multiple tags. The same tag can be applied to many different content items across a portfolio. Tags will be used to filter portfolio items.
• URL - Each item can include its own link.  Leave this blank if you do not want to show the project URL.
• Status - Whether this item is published or not.
• Language - Items include a basic way to implement a multi-language site. All items may be associated with different languages.

We suggest adding at least 3 or 4 items before you will create a menu link to the component view. But in general, the component can use unlimited items and their tags.