Replacing sIFR font [Blissful Blog]

The theme I’m utilising here uses a custom sIFR font which is fine and dandy, but I have had NO luck figuring out how to replace it with my own. I found the only .swf file in the theme and replaced it with the one for my desired font but nothing changed. I’ve dug into the code trying to find anything that might need changing but it doesn’t help that I’m not quite sure what I’m looking for. Sadface.