Once you have edited the template, click submit to get your code.
You need to paste your code into the DESCRIPTION field as you create your listing. The HTML view.
A note on WHITESPACE - sometimes the eBay HTML editor adds in lots of whitespace. This can create weird spaces. You can remove html whitespace using tools on the web.
Polite note on SELLING this template - please don't, you didn't code it. If you are developer this isn't hard and you should be ashamed of yourself for stealing. eBay sellers wanting to use this as a base for a DIY eBay template? Go right ahead.