You can find info about creating it through the grad school application portal. It popped up a few days after you state your that you accept your offer.
Have they even sent the deposit information yet? I don't know if it's just because they haven't sent it out, or I'm just late in getting the notifications.
Thank you! I applied for the Advanced Standing program, with a concentration in Administration and Policy practice! I will definitely be attending UW, so if anyone else will be, I'll be looking for potential roommates!