How to join realms on Minecraft PE 0.8.1?

I don't know how to join a server on here and I'm wanting to play on one. I just want to get on one but in completely lost. Your help would be much appreciated!

Guest

To join a server in Realms you must be invited to the server. You can't just join one. This means going on the internet and telling someone your in-game name so that they may invite you.

victor