To reach your account dashboard from Tagboard.com you just need to click on your avatar photo in the top right corner. From the dropdown, click on Log In / Sign Up.
From your Tagboard Dashboard, you'll be able to view, sort, remove, and create new tagboards.
On the right side of your account, you'll see all of your account settings and options. You'll find your, Shared Tagboards, Media Library, Embeds and Embed Analytics along with all your social account options under My Profile and Account Connections.
If your account has access to Themes and Smart Panels you will see these accessible on your Dashboard as well.