How to log out and create new Pidgin account

[Tabo Bat]

Hello. I have Pidgin on Windows 10 and I need to create a new account for a
separate purpose than my first one.

When I open Pidgin and click on Join a Chat, it only shows my original
username. How can I create the option to be able to use multiple accounts?

Also, after I close Pidgin, it often keeps reopening to show me a
notification. How do I turn off this function?