I've just followed the instructions to change theme which has worked with no problems. However when I now go to my admin, I expect to see some of the new template information, but it's identical to how it was before. For example the template (pixelgreen) has boxes, "Short About", "Sponsors" etc, but I can't for the life of me find out how to access these via my admin?
I think you have misunderstood something, the admin area of the CMS presents you the needed controllers and the forms to manage content, and there are some presentation options too, such as managing widgets etc. but you cant have the exact output from the backend. I think I answered your question.