Just pull (up) look like DIY light fix. maybe light glue (one side or under, try only one first) NO twist , you may remove the LED, not big deal, but you have to re glue it, make sure you order just few before decide to replace all, all that kind of lens (china) look almost the same, but inside the clear reflector is dif. angle (50,90,120) i order from e-bay 7 dif. lens when i build up my DIY LED. Some give less PAR and large distortion , some project light like point, some spread nice circle (uniform) a PAR meter will help you a lot to find the right lens, some may be worst than yours.