Hi sweetie! <3 I'm guessin' you're usin' RPGMaker MV? Just find yo project folder, and when you open yo project folder, you shud be able to see a folder labelled "img" there. It shud have a sub folder called "animations". That's the one!
That's probably the one you wanna use, but since I don't have any experience wid MZ, I'm not sure? I know MZ does stuff a li'l differently from MV animations-wise, sooo... maybe check the MZ help file?