stay / walk / sit / gui my mob

I don't know how to create a procedure/trigger that will make my mob able to sit/walk/stand/gui, on the Mcreator 2024.2 version. I've been trying to do this for three days and I've seen and read so many things that are hard to understand or are not all shown precisely. Therefore, please if everything was shown step by step in screenshots, or a specific video showing how to do it, and not the final effect, or just download the ready operation and just show how to apply it in MCreator.

Thank you in advance for any help!