Place the hinge assembly back into the toilet seat with the holes aligned.

Re-insert the damper, small-end first, with your fingers. You should be able to feel the damper sliding into the hinge hole in the toilet seat.

Do the same to the other damper.

If you removed a plastic cover from the hinge assembly, snap it back into place.

With the hinge assembly and toilet seat re-assembled, pick the entire toilet seat back up and align it with the bolts on your toilet bowl.

Push straight forward, until the hinges audibly click back into place.

Finally, close the plastic hinge covers.