Once your virtual room has been created, and the players you invited have joined the room, you can start a simultaneous match against them.
This video is shorter than five minutes and shows you what steps to take!
If you have a person sitting next to you who can tell you the moves, how about trying to attempt a “blindfolded” online simul exhibition? Not sure how many of those have been played so far. Grandmaster Timur Gareyev managed to play a blindfold simul against 48 opponents in Las Vegas, 2016. This simul made it into the Guiness book of world records.
If you missed how to create a virtual room, please click the link above.
We also have a written version on how to play Simultaneous exhibitions in our PlayChess.com help section.
ChessBase has a full article about Gareyev's simul record.