Please use 2 x axle stands and wheel chocks for your own safety!
Depending on the variation, the filter will either be held on with a round steel loop band with a bolt to tighten it, or a plastic cradle that it sits in, which has fixings on the corners that you need to undo to drop it. The loop band cradle type is often rusted to bits or seized if the filter has not been touched in years. First pic is the combined pump and filter housing, second is the VR6 style filter.