I’m rather new here, and I don’t know how to make another skin after the first one. I saved my first one then I wanted to make a second, but I don’t know how to clear the first. Please help! 
There should be a minus sign somewhere at the top or bottom on the page next to a plus sign neer the 2d skin in a corner, click it and it will get rid of it.
Clear your navigation history or just resplenish all faces in a coulour by double-clicking on one, but keep your skin’s face, or you will not be able to see where is the front and where is the bottom 
Sorry for my approximpative English, good luck 