Trying to work skins in Reforged

[Lupaxul]

Hi, I'm trying to use some custom skins downloaded from HIVE on my reforged world editor, but it's not letting me change the path in the Asset Manager? I can get the models in easy, but for skins I don't know how to use them :/ I've followed several tutorials but for some reason I can't change the path. I've right clicked, double clicked and everything, typed in the path manually, so I dunno what I'm missing out, can someone please help me?