I was scheduled for bio appt but on the day it was scheduled, I will not be available. Was able to reschedule it for next week via the website they indicated on the bio appt letter. After probably 10-15 mins, I got confirmation and my online account showed a new appointment letter with my preferred schedule for printing.
I guess this was also one of the perks of them creating online accounts for us. I thought I had to call/ chat with someone to help me reschedule