First go to the homepage https://webgate.ec.europa.eu/maritimeforum/en/frontpage/1119
Then identify yourself by logging in. We use the ECAS system which is used by all institutions of the European Union
If you do not have an ECAS login then you can get one. We found a nice description of how to do this on the European Cosmetic Products Notification Portal
Requesting to join community
click on 'communities'
look for 'European Maritime Day' Community and ask to join
wait for message from administrator to confirm that you are a member