When you do that, you are ready to use this green screen. One important thing before we go ahead is that it is not possible to use the chroma key effect in the top layer of the video, so always add a layer before it.
After reading this, you will get the hang of things. It may be complicated with the new features of Kinemaster to activate a green screen, but worries not, we have got to cover everything. Is Chroma Key the Same Thing as Green Screen?.