On the window you see a lot of text boxes on the right side. That is where the metas can be entered. Meta information is information about the book, i.e. author, date, language and so on. You either enter it into the box, or use the default that's already written into the box. At least the rights and the author fields you will want to change, I guess. This program is written on windows 7 and works fine here. To use the epub checker, you will have to have java installed on your system, additionally. To get an ebook that is valid you will definately have to check it via this tool (a third party program). As you can see a lot of code is automatically generated that saves you a lot of work. The program also creates a batch file that you can double click in order to create an ebook and then to validate it against epub version 2.0.