EDIT: I copied muncher's original post from the change log, as this is the only useful comment he submitted. - BinaryOrange
The font is a ttf file that you need to load into labels, and you don't just open them. I'm guessing you have all the necessary files and have unzipped them.
1) make a CanvasLayer Node
2) make a Label Node as a child to CanvasLayer
3) In the Label node, look for custom fonts in the Inspector menu and click on the drop down. Select NewDynamicFont.
4) Once you make your way into DynamicFont, find font in the selector and clock the drop down on this one as well. Select load and find: "Xolonium-Regular.ttf"
4a) Make sure you give the DynamicFont a size.
5) Type something into the "text" section of the label node and adjust to your liking
