How is everyone able 2 make their own My Little Pony creations?!? I want 2 be able 2 do that, but idk how!!

There are multiple websites or games that you can use.
These two are probably the best:
Pony Creator Full Version: link

Pony Creator V3: link

You can also try this one: link
There's a few others that you could try, but those three are the most popular. Of course, nothing beats drawing your own.
I hope this helped!

you can use the pony creator by generalzoi on deviantART
there's three versions of it but all of them are good