Release the throttle and draw or drive the scarifier along the surface with the tines extended down to scrape against the material, loosening it, churning it and lifting up in pieces.
Make multiple passes across the surface with the scarifier to complete the job as desired. The number of passes required will depend on the material to be abraded, the number of blades or tines and size of the scarifier and the area to be covered.
Rake, shovel or use agricultural equipment such as a combine to pick up the scarified material and cart it away.