To remove a room from your favourites list follow these instructions:
Once logged into the Buzzen website. At the top right click on the Button with your nickname in it as shown and Click on My Chatrooms:
This will load the My Chatrooms Page. Once on the page. you will see under Room a list of rooms you have favourited. To the right of the room name you will see the delete icon ( in the red square in the following image). Just click the delete icon and then select OK on the confirmation popup.
Follow the last step to remove each room you wish removed from your favourites list.