• Login in with Twitch
• Fill the board
• Start the game
• Share link with viewers

The streamer will fill in the viewers' boards, viewers just need to login using the shared bingo board link

You might encounter a "Preparing your stream..." screen at the start of each round, to get rid of it you can subscribe to Twitch Turbo or change the video type to clips or get a better Adblocker :)

If you have Twitch Turbo but still see the screen, make sure you are logged in to Twitch on the same browser. You might also need to allow third-party cookies in some browsers

More info here

If you want to opt out from being randomly picked for the game, use the =optout guessr command in OkayegBOT's chat