How do you that the screws out of the toilet bowl to replace the wax ring?

They may be screws into the floor or bolts into the floor flange. They can rust or the flange can rust and no longer hold the bolt so that you can take the nut off. Use a hacksaw blade to cut the bolt between the nut and the base of the toilet. A new pair of bolts costs about $3. Tighten them down and cut off the extra above the nut.