In this previous discussion we mentioned how we’re improving the ability to report harassment you see in game, whether it’s directed at you, or someone else.
With the most recent Zwift Companion app (version 3.25), you can report a member directly from that person’s profile in the ZC app at any time (i.e. either during an activity or after you’ve finished your session). A key improvement is that problematic behavior is more specifically defined, and you have the ability to give us more information in a comment.
For a more thorough walkthrough, please see our detailed article on our Support Hub