Cut the grass and weeds back.

Lay a layer of manure or compost on to the ground - about 2ft 6in wide.   Allow 18 inches of clear ground on each side of the line of manure.

On one side of the bed, cut a straight line with a spade, parallel to and 18 inches away from the manure edge.   Now cut strips of turf, so that they have a "hinge" at the manure edge, and fold the sods over the top of the manure to cover half of the row.

Do the same down the other side of the bed.

Dig the newly exposed soil from each side of the lazy bed, break it up with a fork, and turn it on top of the turned sods - aim for a nice level surface, with a good covering of soil, and flatten the top with back of your spade.
One finished lazy bed!