In order to create a FIT/CorteXlab account, you must signup on this page: https://xp.cortexlab.fr/app/signin. This webpage also allows you to manage your account (update user informations such as your email, update access keys, etc.). The signup procedure involves registering your email to the CorteXlab users mailing list (low traffic), so you will receive a mailing lists subscription confirmation email.

Note that in order to access CorteXlab, you need to use ssh and you need to provide an ssh public key. Help on the SSH key generation.