Hello Kristofer, I see that there are all the info there to explain you how to do that.

I just remind you, you have to use the HTML Code Object where you can add the HTML code and the CSS code.

Morover you can add any other code you need (ie: in the HEAD of the page) from Step2 | Page Properties | Expert.

You need to know something about HTML and JS , maybe someone else here can help you!