Part in Blue should be replaced with the URL of the picture that you have. Please be careful not to delete the " "
Part in Purple is the opacity settting. This decides to which level your picture is visible. opacity=100 means the whole picture is visible and 0 means its invisible. [Increasing the Opacity makes the picture stronger at the middle i.e. you see less of the picture at the edges ]
Increasing the FinishOpacity does the reverse (ie you see less of the picture at the middle, hence if you set the Opacity and FinishOpacity to the same number you will have an equal filter right across the picture).
Changing Style, the part in Green to 1- fades left to right, 2 -fades centrally and 3 - fades from the corners.
Play with the values to get the desired Picture effect. Click on the button again to get out of the HTML editing mode to see the result you get when you change the values.
Publish your entry after you get your desired effect !