How to buy tickets for potential Chiefs-Bills AFC Championship game in Atlanta

The NFL announced details on how to purchase tickets for the potential neutral-site AFC Championship game between the Kansas City Chiefs and the Buffalo Bills at Mercedes-Benz Stadium in Atlanta, Georgia, on Tuesday morning.
To qualify for the neutral site, the Chiefs must defeat the Jacksonville Jaguars and the Bills must defeat the Cincinnati Bengals this weekend in the Divisional round. The AFC Championship game will be played on Sunday, January 29, at 5:30 p.m. It's Arrowhead Time.

The league has issued the following statement in an official press release:

Season ticket holders from both teams who previously opted in to purchase AFC Championship Game tickets will have an exclusive presale opportunity to purchase tickets to the potential AFC title game in Atlanta at a discounted rate beginning at 9 a.m. CT on Wednesday, January 18. Season Ticket Holders will be given unique passcodes that are linked to their season ticket account. Each club will contact Season Ticket Members via email with additional information on how to participate.
All other fans who want to buy tickets can sign up for a passcode to participate in a presale, subject to availability, starting at 9 a.m. CT on Friday, January 20. Fans who want to participate in the Friday presale can register at https://www.NFL.com/AFC.
If the neutral site game is confirmed, any remaining tickets following the presale will go on sale to the public on Monday, January 23 at 10 a.m. ET through www.ticketmaster.com, in partnership with Ticketmaster, the NFL's Official Ticket Marketplace.
The NFL also stated that there would be a six-ticket limit per purchase, and if the Bills and Chiefs were unable to meet, all tickets would be refunded in full via the method used to make the purchase.