@ILO saidPresumably you are logging in with saved credentials - username & password saved by your browser?
Is there any way to figure out what password I used to log onto this site?
This might mean that you "just log in" without having to remember what that password was ...?
In which case it all depends on the browser version and how you log in.
e.g. In Chrome, click the three dots in the top right, select "passwords and autofill" then "Google Password Manager", search for this website and you'll be able to access the saved password info.
In other browsers it'll be similar .. but different.
Hope this helps.