This is pretty simple, actually. Two steps, and you will be done.
NOTE: This tutorial will apply to both members and guest viewers.
1. Scroll to the bottom of the page, to begin. Click on "Theme".
2. After you click on "Theme", a drop down menu will open, showing the skins / themes available to you. Click on your choice of available options.
3. Now, you have your new skin / theme to check out.
Please Note: I am actively looking for other skins / themes that may be more suitable for members viewing the site. So, that list may change somewhat, in the near future.