Gather a replacement stopper that matches your drain type
Remove the old stopper
Unscrew or lift out the stopper assembly
Remove any visible retaining screw or linkage
Pull out the stopper and connected parts
Clean the drain opening and threads
Check the drain size and stopper fit
Insert the new stopper assembly
Reattach any linkage, screw, or pivot parts
Tighten the parts securely
Test the stopper by opening and closing it
Adjust the linkage or height if needed
Check for leaks around the drain
Replace the drain cover if applicable