It is a good idea to seal your concrete if you want to protect it from stains and general traffic. There are sealers on the market that you can purchase that come in a liquid form in buckets. You should first make sure you have a clean surface to work with and then using a paint brush or roller to apply the sealer. Directions regarding drying time will come on the can. You should also make sure the area is well ventilated and probably have some fans running.