Unfortunately it is not possible to directly create an account for seagoing vessels. You need an invitation from the agent / terminal to supply pre-arrival information via UAB-Online. Contact the agent to receive an invitation from one of the participating terminals.
More information about the benefits of UAB-Online can be found at: uab-online.com/en/register-vessels
If you have received an invitation from the terminal / agent, but do not know your login details, you can request a new password here.