Go to https://store.trionworlds.com/account/profile/manage-game!input.action?dd=1 and login from there.

Once you have logged in click account and click apply code!

Once you click here, use the code from the image I have posted. Once you have accepted it the code, it will show that a refer a friend has been activated!
( Here's the code YX3TEDQ9GLQ63Y2Q7EQ6 )

Once you have reached rank 20 you recieve a free Class Coin!

And thats how you do just to get the free class coin. Thanks everyone for seeing this guide!

If you have any help just post it on the comments!