How do you ban people from your world in Minecraft PE?

My friend Evan,is griefing me. When I went on his world to get revenge, he banned me. The screen said " HerobineYoung has banned enderpizza you will be kicked out in 5 minutes." I begged him to tell me how but he wouldn't tell me.

How can I ban people in Minecraft PE?

Your 'friend' was able to ban you because he was using a separate server app to play with you, not the built-in server (which doesn't take any commands at all).

Most Minecraft PE server programs/apps support administrative commands reminiscent of those in the regular Minecraft server, such as /kick, /ban, and /echo.