It was in the renewal letter rcvd in the mail with the invoice. I am pretty sure I saw this linked through the STH website as well but I took a quick look and I don't see it anymore (possibly taken down after the Oct 3 date?). Here is the verbage from the letter ....
Account Set-Up Clarification:
Toronto FC will be providing existing Season Seat Holders a one time opportunity to clarify their initial account set up and reallocate their subscription(s)/ticket(s) purchased on behalf of family members/friends. This window will permanently close on October 3rd. Please visit the Toronto FC Season Ticket Holder website at torontofc.ca for more details.