Load a video or create a new one, then select a time range, beginning and ending. You can view the preview for the time selected. Remember 1 second is 1000 milliseconds. Keep it mind that you're using a mobile device and memory and other resources are limited. You can view the gif specs at the end of the main window. When gif is created touch and hold for view it in the gallery.
-Quality: 25% -Size: max 320x240 -Gif duration: max 10 seconds -Frames number: max 80