Select the Use a Custom Stylesheet radio button to use your own XSL stylesheet to determine the format of the report.
You can either:
Specify the stylesheet name and a full or relative path in the text box. (If you specify a relative file path, it is relative to the location of the XML file.) If you only specify the stylesheet name, Developer assumes the stylesheet is in the same directory that the XML file is saved to.
Press Browse to find the stylesheet, if it is not in the Developer working directory.