Report it here > https://forums.minehut.com/forum/23-player-reports/
Make sure you follow the format > https://forums.minehut.com/topic/9792-player-report-format/
You can give users permissions by using a group managing plugin and the only way to give people access to the console is to give them the password and email.
Check the logs for any errors (panel > file manager > logs > latest.log)
The errors should be pretty straightforward but I'm more than happy to check them out if you upload them to pastebin ^^
If you think they're breaking the server rules (read them @ https://forums.minehut.com/rules/) then you can report them on the forums under "server reports"