How to install FlashCap
FlashCap (PC)
Product: https://www.flexigear-gaming.com/en/products/flexigearbuttoncaps
30mm
1. The image below shows the FlashCap and a FlashTap without a cap. The FlashCap has two notches, as indicated by the red arrows.

2. Align the notches on the FlashCap with the tabs on the FlashTap, and firmly push the FlashCap all the way down.

24mm
Regardless of the cap's orientation, it will work correctly as long as it is pressed on firmly.
FlashCap-Nylon-Convex
Product: https://www.flexigear-gaming.com/en/products/flashcap-nylon-%E5%87%B8
24mm
Rotate the cap while aligning the wider opening of the cap with the tabs on the button body.

30mm
As long as the cross shape is aligned, simply push it firmly all the way in.
FlashCap-Nylon-Concave
Product: https://www.flexigear-gaming.com/en/products/flashcap-nylon
As long as the cross shape is aligned, simply push it firmly all the way in.