Xcode 6 - Defining an outlet

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Objective-C

Im new to xcode 6 along with like 1000 people due to the xcode update, I was wondering how to define an outlet, in the old system you just use file owner, but xcode 6 dosen't have that, this is programming for ios by the way.

I know to define an outlet it is

IBOutlet UIButton * themenubutton;

But my problem is, i do not know how to connect that outlet to a button in the interface builder, i cannot find the outlet, ive searched the web and youtube they are all out of date and are useless, i was wondering if anyone can help me with this?