Keep the remaining five healthy branches. These are often dark green. You will want to make your roses fluted or vases shaped, with an open center, and keep them from touching or overlapping each other.
Cut your healthy canes to be about one to four feet long, or whatever size that you adopt.
Cut you roses properly so that they stay healthy. Cut so that the bud is facing outside of the bush and at a 45 degree slant that slopes inward so that you can keep promoting the outward growth.