Cycled to the local health insurance office.
German health insurance is similar to the UK, but we have a choice of providers, most people, like me are with one of the big government owned companies and they occasionally ask me to fill in a form online. As I am to computers what Genghis Kahn was to international diplomacy, I've never managed this, but fortunately I can just go to the office and ten minutes later everything is sorted out and I know I'm not going to get anything returned with "insufficient information, do it again properly this time" on the top.