You should also do a comparing the token you want to announce to another token like it's feature and uses. Try checking on the board that Maus0728 provided and i'm sure you'll get your idea. Also, it's advantage why  people should be aware of this token. About the copper membership that is suggested is for adding images on the Ann thread when you are going to post it. Newbies posting images won't be shown unless havaing a copper membership which will remove the restriction.