Pop the bezel off as described in numerous YouTube videos. Exacto knife carefully through the glue holding the insert. Use 3m insert ring to replace glue (https://www.amazon.com/Adhesive-Rings-Sticking-Insert-Submariner-GMT/dp/B07D6T27GB) to stick the new one on. Pop the bezel back on.
You can use glue or bezel tape rings.
Glue: https://www.esslinger.com/amp/gs-crystal-hypo-cement-glue-watch-crystal-/
Tape (get the right size) like this: https://www.amazon.com/Adhesive-Rings-Sticking-Insert-Submariner-GMT/dp/B07D6T27GB
Just press in and hold for a few seconds and you’ll be fine.