Hello
You would place in admin global options the server path to a file of your choice to use as a header. In that file you place whatever html you choose. We by default provide you a stock header.htm and footer.htm file
Please to help us provide you with better instructions please go here to our instructions page and point out what you think needs expanding on. I think they are quite direct but who knows
http://www.photopost.com/class/supportphp.html
There is no indepth manual on each setting. Most are very self explanatory but if you have any questions let us know