You have already opened the file in the converter and chosen the suitable format! All you need to do now to start converting is to press the button "Start conversion"
It is necessary to mention, that the button "Start conversion" will change to "Stop conversion", by means of which you will be able to interrupt the conversion. Progress bar control shows you how much video has already been converted in per cent correlation. Also, under the form you can find the information about the rate of conversion (frame per second), and the time: how much time the video has already been converted and how much time is left.
The installation "Preview" allows enable/disable the display of the video while converting. On low-performance machines, the disabling of this function can accelerate the process of conversion.
When the conversion is completed, the program will inform you about the end.