To sign in, use the button that you will find in the upper right of the window.
You must give your nickname or email, and your password.
Now you can sign in using this link,
Once you hit the Sign in button, you will receive one of the following responses:
If you have linked your account with a Google or Facebook account, signing in is even easier. Just select the option to access with Google or Facebook, and if you already had an open session in one of these services, the Ludoteka session will automatically open.