If you forgot your SeKA password, you can set a new one yourself, if you remember the answers to the personal identification questions that you typed in during the activation process. You must type in the answers exactly as you did the first time (except for upper and lower case letters – they are considered identical). The password self service is here, you need to click on the "Forgotten password" button.
If you don't even remember the answers to the personal identification questions, you can call the helpdesk or write an email.