Selecting a skin

I know this is a stupid basic question, but I download the themes and selected one of the skins, I now want to change to another of the available options but cannot figure out how to do that. Can someone tell me how?

Hi,

Please contact the author of your purchased theme, theme author will assist you.

How to contact an author to get support or for any technical query:

Also you can check the theme documentation hopefully you will get necessary help.

Thanks