for an example, i'll use that it/its/itself
This is my friend Katie. It went to the store by itself to by its grandma some flowers.
if they use for example he/its
This is my friend Kevin. He always gets good grades, so its parents always buy him the latest video games. Right now, its favorite video game is Minecraft.
so basically you just replace where she/he/they would be in a sentence, with the neo pronouns. or you can switch between neopronouns and normal pronouns. if you have any more questions just ask.
and it's the same as noun pronouns such as moon/moons/moonself