Well first of all, the actionbars are firing an event so the only thing you need to do is bind the “Event/Function/Whatever” to the event dispatcher that is provided.
A good example is to see how I did the spells. They have an event which is added to the event dispatcher.
Now the spell book is more of an “example” on how to do something similar! But if you replace the spell blueprints I provided with your spells (and have a function that returns the description and the icon) it should work well enough!
Unfortunately I don’t have access to the spell system in the marketplace but I will try to make a tutorial for the UI kit as soon as possible since you have trouble! 
And if you need more information until the tutorial is released, feel free to post here a more specific question!