1-2. What do you mean by editing users and parameter management? User session consists of requests listed in the virtual user profile. Each request can contain a number of parameters. They all are listed in the right view in WAPT (the Properties tab) when you select a request in the left view. Here you can specify how to calculate the value of each parameter for each user session.
3. A very general question. In short, you should first check the error rate, then response time and number of sessions per second or minute.
4. You can specify the value of a parameter as "$Var(variable_name)" to make it use the value of the corresponding variable.
5. The value of a parameter can be calculated with help of internal WAPT functions. These functions can either use external files to read values or analyze the server response to the previous request and extract values from it.
6. These rules let you find problems that are not reported by the server as usual errors. For example, it can produce an error message in a form of a regular page. Such page can contain the "error" word. So, you can specify to tread as error all pages containing the "error" word. Of course, this is only possible if normal responses do not contain this word.