What is two-step sign-in, and do I need it?

It asks for a six-digit code from an app on your phone, as well as your password. Anyone who learns your password still cannot sign in.

It is available to every account with a password, and it is required for staff and for anyone who reads verification documents or financial data.

You are given recovery codes when you set it up. Keep them somewhere other than the phone. They are what gets you back in if you lose it.

Setting it up starts in your account, under security. The setup expires if you leave it unfinished, and you simply start again.

If this did not answer it: support inside your account is under development, and until it opens, this says what does reach a person.