is Player Skin/Avatar changing possible like in normal Minecraft?

Inside the Minecraft launcher it is very easy to change your player skin/avatar, however it seems it is much different in MCreator due to it not opening the launcher. Is there anyway of changing my player skin/avatar to my own custom one or even to one of the Minecraft default ones like in the Minecraft launcher? (btw I don't want to change the skin/avatar in code/"code blocks" I just want to be able to change it, so it spawns with my skin/avatar like in normal Minecraft)

sorry if I didn't explain my problem very well, please ask me for extra details on something you don't understand. :p