I want to replace front end icon of check-box form assignment(Require to complete by student) to red flag and this flag will again changes to green flag on completion of activity by student.
Please suggest solution
This icon is found in the pix folder, I would expect, and once you have the name, do a grep search for that name in the code. From there, you will have to change the image name in the code. This takes a long time and is not always guaranteed to work properly afterward. Be careful because unless things match exactly right, it can be a real pain.
Names and sizes are important here, suggest you replace the image by renaming the original and your preferred image takes the same name as the image you are replacing. It must also be the same dimensions. As for changing the images from ret to green flags after completion, IANAD so don't know if this can be done easily. Changing images dynamically is relatively easy, but changing them on cue, that is the hard part.