Podtrac with Squarespace

Anyone have experience setting up podtrac? We currently run our show from Squarespace to feedburner (we just don't trust that feedburner will be around forever, so we didn't want to HOST there and lose it all potentially), and we want to route through podtrac for metric purposes. Unfortunately, Squarespace doesn't seem to let us mess with the enclosure tags to put in podtrac's prefix to get it done. Am I doing it wrong? Is there another way? Thansk!