The document provides instructions for changing a toilet seat in 5 steps: 1) Unscrew the old seat by removing the plastic screws and nuts underneath; 2) Lift off the old seat; 3) Assemble the new seat according to the manufacturer's instructions, inserting retaining bolts; 4) Attach the new seat to the toilet bowl; 5) Hand tighten the plastic nuts to secure the new seat, adjusting its position before fully tightening.