Creating Spaceteam style peer-to-peer lobby

I'm trying to create a very basic, mobile, networked game. I've got the networking working pretty basically, but it still relies on entering the proper IP Address and port information.

Is there a way that players can just hit one button and whoever hits it first will create the server and the others automatically join their game?

From what I've seen online, it seems like you need to use a Master Server. I've started looking in to that but can't seem to get it working and I'm not sure why. I downloaded the XCode project and tried to compile it but am getting an error saying "Use of undeclared identifier 'Height'" and I'm more than a little hesitant to change it since I've never used XCode and have no idea what I'm doing there.

Is there another way to do this or do I have to struggle through figuring out the XCode project?