Simple first time user
How do I start a lesson or take a test? Help.
Click "Home" in the top menu bar, then in your tree select an open skill (probably Basics 1). You then have the option of starting a lesson (click on a blue book) or testing out of the skill (upper right hand corner, "Test Out").
You can also scroll down in your skill tree and click on the yellow locks in order to skip ahead if you are more of an advanced user.