Very noob question, forgive me

[Real Name]

Man Im old so forgive me I have a stupid question

How do I log in the game? I have the normal log in screen with user name and password, I assumed that it was the same as my user name and password here, then thought back to 2015 when i restarted this, then got confused and change password then it took 4 days to figure that out.

If anyone can help, twitch has me having full nostalgia and ....never got that fungi tunic hehe