Shouts are Messaging and chat in VirZOOM Arcade is primarily through shouts, pre-recorded messages you can blast to other players in VirZOOM Arcade games. There are two kinds of shouts: text and emoji.
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Once options are up, you can use the directional pad (on the other bike handle or on your controller, as appropriate) to choose which one you want. Note that the handlebar buttons only work if you’re playing with a VirZOOM bike on Steam. If you’re on a PlayStation, you need to use the buttons on the DualShock controller.
For voice chat, you can use Steam Voice Chat on PC, or start a Party on PS4. Just remember that VirZOOM games are exercise games, and people tend to breathe loudly when exercising!