Visit our Discord and post your complaint in #reports. Use whatever format you want, but make sure to include the date and time of the incident. Condumps and screenshots aren't necessary as we can look events up in our logs. We'll need a demo or a video if you're reporting a cheater, though.
Before reporting make sure you're familiar with the server rules. When in doubt ask an admin.
You can report a player using the command:
!report [the player] [info]. Use the “info” field to describe your complaint. The system registers the time of the complaint, so there's no need to type it in manually.
Consider posting on Discord if your problem is too complicated, multiple people are involved or if in-game reporting fails for some reason.