My Pesterchum won't open!! D:

PLEASE READ okay, so I got pesterchum, and accidentally made my first account the one it automatically signs into, and didn't know how to change it back, so I deleted that account and logged out of pesterchum out of boredom. And I know that it won't open because it can't open to that account anymore, I just don't know how to fix it. Does anyone know how to make a dif account primary in order to allow it to open again?