Password not working on site but on game?

So I have a main account, which I have barely ever used to come on the site.
However, I play the game nowadays with said account, but when i put the info on the site, it never works.
I also don't remember what email it was for, as I created it a long time ago, and i hadnt had wifi until a month or two ago.
I can provide the username (Daystarrdesu). my password doesnt work, for some reason.
Any help is greatly appreciated.
Thank you.