Operating steps of dragging the progress bar for the video source code of vocational education cloud reform;

1. Open the video player of Vocational Education Cloud and find the source code of the progress bar.

2. Find the code segment related to the progress bar, which can usually be located by searching for keywords such as "seek" or "progress".

3. Modify the code as needed, such as modifying the appearance of the progress bar, adding prompt information and changing the behavior of the progress bar.

4. Save the modified code and test it to ensure that the function and appearance of the progress bar meet expectations.