If you’re on the Free plan, you can create a project through the desktop apps. You can download & install Zeplin’s Mac/Windows apps here: https://zpl.io/download
Once you have the app installed, go to the Projects screen and click on the “Create” button that appears in the top-right.
On the paid plans, Starter, Growing Business, or Organization, you can create projects through the Web apps. To do this, go into the Projects page and click on the “Create” button that appears in the top-right.