You can create and set a Homepage to your website to introduce people to your website. You can either create a custom Welcome page or have your Portfolio open to a specific Page or Gallery.
You can create a new Page by clicking on "+" (Add Content) on the left side of the screen and then “Page”.
Once you've identified or created your Homepage, click on "Settings" and navigate to "Homepage". In the first drop down, you can select the Page you've planned on using for your home page.
You may also set a Page as your Homepage within the Manage Content panel:
Note: You will have to Publish your site to apply the new Homepage.