To be able to use Fiduswriter at the TUM at https://fiduswriter.tum.de you must have a TUM account. After you click the https://fiduswriter.tum.de login button you are taken to the TUM login page as shown in the screenshot below. You can only invite collaborators who also have a TUM account. Should you need to invite non-TUM collaborators, you have the option to switch over to the commercial version at https://www.fiduswriter.com where you can invite any other person without a TUM account. You are only allowed two free documents on the commercial version though.
