How do you repair a broken toilet tank cover?

To repair a broken toilet tank cover, first assess the damage. If it's a minor crack, use a strong epoxy adhesive or super glue specifically designed for ceramics; apply it to the crack and hold it together until it sets. For larger breaks, consider using a plastic repair kit or reinforcing the cover with a piece of plastic sheeting attached with adhesive. If the cover is too damaged, replacing it with a new one may be the best option.