Free, and it takes a minute. You need one to add a meeting or confirm a record, because every entry carries the name of whoever stands behind it.
Never shown publicly. Used to sign in and to tell you when something you submitted goes live.
3–24 characters: lowercase letters, numbers and underscores. This is what appears beside anything you add, like @prairie_dad. You can change it later, and every past contribution updates with it.
At least 10 characters.