So Minecraft recently updated Pocket Edition to version 1.0/1.0.2. With this they changed the way you join servers because they are trying to get you to join using Xbox Live as well as joining Realms. Well here is a step-by-step guide on joining a MCPE Server on 1.0.2. Be sure to follow each step and if you need any help joining a PE Server, please contact us and we can try to help you out!
As a general guide, to join a Minecraft Pocket Edition Server requires changing your name, tap on Friends tab and add a new server. Join the server and register. If you need help then make sure to follow this guide!