How to insert Cherry MX Keycap?

I bought a Cherry MX Switch and its KeyCap, but since it is not inserted. Pressing the button sinks, not anchoring its head to the button.

I just thought I’d disassemble the button to insert it. But in doing so, it stopped working, after many attempts I got it to work but to close it I had to take his head off.

Surely there is an easy way to insert such Key Caps! Please tell me how to do this without opening the button

Thank you!

Oh! simply squeezing hard. I guess when I tried, I was afraid to break it or I wasn’t on loan. But when I try now, I come in easily.

Excuse me! :o