This can be easily done by editing the Essentials config.yml. Firstly, you need to locate this configuration file within Minehut's File Explorer (File Explorer -> Plugins -> Essential). Then, you need to locate the line which contains
format: '<{DISPLAYNAME}> {MESSAGE}'
The rest should be pretty self-explanatory: simply remove the < and > around the {DISPLAYNAME} (make sure to keep the squiggly brackets in, or else this will not work. Of course, you can put a colon after {DISPLAYNAME}.
Once you have finished editing your Essentials configuration file, save it and restart your server.