How do I add a password?
If you signed up with Continue with Google you have no Lonzo password. To add one, open Account, find the Password row — it reads Password (not set) — and choose Create. Enter the new password twice. You are not asked for a current password, because there isn't one.
Adding a password does not replace Google sign-in. Both work afterwards: you can choose Continue with Google or type your email and password, whichever is to hand. Nothing about your Gmail or Calendar access changes either — that is a separate permission.
You stay signed in on this device and everywhere else; adding a credential is not a reason to end your sessions. We email you to say a password was added, so that if it wasn't you, you find out. If you get that email and did not add a password, reply to it and tell us.
Later on, changing that password works the usual way and does ask for the current one, and setting a new password then signs out your other active sessions.
See also: How do I sign in with Google? · How do I reset my password? · How do I sign out everywhere?