By clicking on the "Browse..." button, you can select the EDI file from your hard drive. You can also enter the path (and the name) of EDI-file manualy in the input box, but it's easier and faster with the "Browse..." button.
After that, click on the "Upload" button. Program will read your EDI, determine which contest it belongs to, show it to you and allow any necesary corrections. Please, pay attention to the darker boxes, especially category (PSect) and frequency (PBand), before you click on the "OK" button at the end of page.