Portfolio: How to Set Up?

Hey everyone, I know this isn’t a wordpress official theme, but maybe you can help me, It’s driving nuts!

I’m using WPExplorer’s “ELEGANT” theme, which comes with a Portfolio feature, but I have no idea how to set it up…
I’ve tried renaming a page and slug to portfolio-page, portfolio, portfolio-item, and nothing shows up.
I’ve added 2 items in the portfolio, and It doesn’t show up anywhere in my website. Do I need to set up a tag for those or something?

Thanks in advance!