Everyone who has been invited by the related working group leader or the expedition leader of an expedition, gets an automated mail-invitation with a link to the EIS system.
If you have not been invited any time before, you you automated mail-ivitation will contain a registration link for the self-service-portal to register your account in EIS.
As soon as you have registered or logged in to EIS, you are deviated to "My participation information". Here you find the expeditions you are invited to: