First of all good day, since I bought minecraft, I put on the skin wanting to play, what I realize is that I can not put, what I mean, it lets me put the skin of my profile on the web, but no It lets me put the skin from the launcher, I want to put other skins in my library and I get that the aspect can not be saved *, please help me to solve other problems, by the way, I already uninstalled and reinstalled Minecraft and still with the same error.

Thanks and good day