Question Animation Rigging

I'm using the animation rigging package, and I imported a rigged character from blender and managed to hook it up with the rig builder and all that, so I can see and move the bones and the mesh moves fine. But when I try to use the rig builder and move the target of for example a leg, nothing happens.. I've followed tutorials and searched around but I can't seem to figure out what is wrong.. Does anyone know what could possibly be happening?