To add your first website, just click the '+Add Website' button.
Domain: Enter your new domain without https:// and choose between www and non www.
Group: Groups are niches – save sites into groups. You can have different groups for things like Health, Dentists, Business, Home etc.
Name: Name your website anything you like
Tagline: Standard WordPress blog tagline (optional).
Theme: Use the pre-selected theme or choose another (you can update it later too)
SEO Plugin: Choose from the most popular SEO plugins
Cache Plugin: Choose from the most popular Cache plugins
You can, of course, add more themes and plugins once the website is installed.
What are you waiting for? Go get your first website added!