If you're updating a bathroom, you'll need to know how to replace the toilet. Apply a wax seal over the floor toilet flange to prevent sewer gases from entering the room. For extra protection, put a second bead of plumber's putty to seal any imperfections between the floor and the bowl. Place the new bowl firmly and evenly over the seal and bolt it to the floor. Attach the tank. Cut your toilet tube supply to connect the tank to your water supply. Fill and tank and flush away!