How do you replace hot or cold knobs in a stand up shower?

To replace hot or cold knobs in a stand-up shower, first, turn off the water supply to avoid leaks. Remove the knob by unscrewing any visible screws or using a flathead screwdriver to gently pry off the decorative cap, then unscrew the knob. Replace it with the new knob by reversing the removal process, ensuring it fits snugly and securely. Finally, turn the water supply back on to test for leaks and proper functionality.