Have you applied to be a member? If so, and your application was accepted, you just have to be patient to be whitelisted <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f642.svg?0" type="image/svg+xml" standby=":)">:)</object> If not, submit and application to be a member.
You can speak in guest chat. I believe the command is /ch join guestchat.