To give yourself access to all the server commands, you will need to be a service operator.
To do this, visit the Console in your VillagerHost Control Panel, and simply type: op USERNAME
Please note you will need to be online on the server to issue this command otherwise it will simply not work.
Then click Enter. Congratulations - you now have access to all the server commands. Please remember to only issue this to people you trust, as it allows full access to all server commands.