I'm sorry but I don't know how to use TLauncher as it's not part of the Wurst Client or vanilla Minecraft. Wurst is designed to work with the official Minecraft client from Mojang.
As I mentioned earlier, Wurst itself can't directly change skins - it only lets you "steal" the PNG files. The best way to change your skin is via the official Minecraft.net website. Using a cracked account or launcher could prohibit your skins from working correctly.
PS: I've merged your "..." thread into this one. Kindly avoid redundant threads with vague titles - it'll help keep our forum clean!