First you Sign up or Log in if you already have an account.
Then you see the (probably empty) project list. Write a project name (e.g. Test)
in the box and click [Create].
The name appears in the project list - click it to edit it.
In the card list you click and fill in the question and some answers.
Click [Add card] for each new card you wish to add.
That's it. To try out your project click the [Exercise button].