Here you can find a classified list of questions about the Site Builder, together with brief answers. These mainly say what you can and can't do with the Site Builder, and sometimes why, but normally not how — longer explanations will be found in the "Help" texts associated with each of the menu options.
Please check to see whether your question is answered here, before contacting the Site Builder support team. It's a fair bet that someone else has asked it already, and the answer is here!