1. Create an account
You need to register on Dashboard.
2. Create your polygon
Click on the polygon icon or square icon on the map.
Draw your polygon. If you choose a polygon shape icon do not forget to merge the first and last points to finish your polygon.
Fill in the "Name" field and click the "Create" button to save your polygon.
You can continue to create polygons or go to the list of created polygons.
Now you can go to the "Satellite imagery" tab and get data for your polygons.
How to work with the "Satellite imagery" is here.