It's easy. Download FileZilla (assuming you haven't already), put the box IP address as the host name, username is root, password just leave empty and then hit quick connect. Then you put the file in /tmp (you can either type it in the bar on the right panel or just navigate to it in that right hand panel), then on your box press menu, go into vix and then ipkg installer/local extension installer (forget the exact name on vix). Then you click on the skin file, and it'll install. If it doesn't tell you to reboot, reboot anyway, then go into the usage and gui settings and skin setup and it'll be in there ready to change over to.
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