How do i get a prefix from Essentials GroupManager?
I don't know how to hook or get the prefix of a players group.

it is a part of the chat interface, you can browse the source code on github, https://github.com/MilkBowl/Vault/blob/master/src/net/milkbowl/vault/chat/Chat.java

Please follow the instructions on setting up the Vault Chat service from the main page. If you're having trouble with this the bukkit forums are a good place to get help.

Wow what lovely Service you have.

@dadragonslaya - I'm sorry if you don't feel like I put much effort into a response, but based on how you phrased your question, with no code at all, it made it appear like you haven't even attempted to get this working. I feel my response reflects the amount of effort you put in. If you are having problems getting the code examples to work then please detail out your problems.

I have vault hooked, but i have no idea how to get prefixes thats the thing. Is the prefix part of permissions or chat?