Potent Dragonmark Problem!

When I was trying to make an Aberrant Dragonmark Eldritch Knight and I got to the Potent Dragonmark feat, for some reason I couldn't select an option when I got to it, am I dumb or is it a error bug mistake?

The spells I chose for the normal Aberrant Dragonmark feat were the two new ones from Exploring Eberron (Force Blast and Concussion Burst), then selected Greater Dragonmark, then finally, I wanted Potent Dragonmark, and that's where my problem started.

So again, am I just dumb, did I make a mistake somewhere, or is there a bug problem?

That's the point, is there supposed to be choices or no?

I would imagine that there is supposed to be choices since it says that it has options to choose from 

That's the point, is there supposed to be choices or no?

What does your source book say about this?  Is that different?