Turn off the water supply to the toilet
Flush the toilet to empty the tank and bowl
Disconnect the water supply line
Remove the toilet mounting bolts
Lift the toilet straight up and set it aside
Scrape away the old wax ring from the flange and toilet base
Inspect the flange for cracks, rust, or damage
Remove any screws or fasteners securing the old flange
Cut or chisel away the old flange if it is glued or damaged
Clean the pipe opening and surrounding floor area
Dry-fit the new flange to confirm proper size and fit
Install the new flange on the drain pipe
Secure the flange to the subfloor with corrosion-resistant screws
Ensure the flange sits level and at the correct height
Install a new wax ring or wax-free seal on the toilet
Set the toilet back onto the flange and align the bolt holes
Press the toilet down evenly to seat the seal
Install and tighten the closet bolts evenly
Reconnect the water supply line
Turn the water supply back on
Flush the toilet and check for leaks
Caulk around the base if desired, leaving a gap at the back if needed