seat adjustment

Our driver's seat is slanted to the back. This makes my knees higher than my hips and boy is my derriere sore, especially the "sits bone". Is there a way to adjust it that I am not aware of ? I may have to order a wedge. I did purchase a seat cushion, but it's for a car, so it's small and...

I am having difficulty adjusting driver seat so I can reach gas peddle comfortably and bend my arms while driving. I have the seat as far forward as possible and and lowered as low as it will go. Is there any way to get closer?