Sync between desktop and web not working

Hello everybody,
I’ve created a deck on PC and trying to sync it with AnkiWeb, but getting a wrong ID/password message. I know that password is correct as I can easily log into AnkiWeb.
I read somewhere that I need to log out of the desktop version and log back in, but I can’t figure out how to do that. Tools → preferences → network do not lead me to any “disconnect” buttons.
Anything else I should try?