In order to create a Nonprofit Dashboard, you must first have created a Ticket Event or a Donation Website. Once you have created one or both of those, your avatar dropdown menu will display a link called My Nonprofit Dashboards. 

Clicking it brings you to a My Nonprofit Dashboards page, where you can Create a New Nonprofit Dashboard

Step 1 is to name your new dashboard.

After that, you can begin to customize your dashboard.