You can either enter the bingo lobby and select the Pre-Buy tickets button to view tickets for upcoming games in all rooms. Or you can log into any bingo room and select the Pre-Buy tickets button there also.
Participation in the bingo room at the game scheduled time is not mandatory for these tickets, they will play and payout regardless of whether you are present in the room or not.
Please note that pre-bought tickets withdraw funds from your account at the time of purchase and all bingo sales are final. When pre-buying tickets with a Progressive Jackpot attached, please be aware that it can be won before the pre-purchased game plays out, in which case the game will continue to play with a new Jackpot linked to it. This means it could have a different value than the one initially advertised.