I made a skin by using Skincraft and I exported it to minecraft.net. I chose my skin and uploaded it. At the top it says,
"Your skin has been changed! Please wait a few seconds for it to update."
I went to Minecraft, clicked singleplayer and chose a random world at the top. I looked at my character, but it's still default. Multiplayer won't load for some reason. I don't know what I've done wrong!