...
- Click on button "Proceed to register..."
- Confirm policy (check Confirm checkbox) and click "Submit" button
- In the confirmation page click "Sign out" or just close web browser tab/window
- Go back to the URL of the service you want to log in (e.g. bamboo.software.geant.org, bitbucket.software.geant.org,...) and try to log in again (follow the login procedure from the beginning)