Place a wooden stick with a string attached in the center of the area you like to have an elevated bed, and then use the stake to draw a circle around the area.
Place the compost cage made of chicken wire in the middle of the bed. Use stakes or sturdy garden wire to keep it in place if necessary. To improve aeration, put some rocks or stones at the base.
Add high-quality soil and combine it with some homemade mulch or compost, as well as grit for drainage. To ensure proper drainage, try to keep the soil level at the compost cage level a little higher than at the outer edge of the bed.