Super CSV doesn't support editing CSV files.
The quick and dirty solution would be to create a copy of the CSV file (i.e. read in each line with Super CSV, then write it out to a different file). You can choose whether to modify the data or to omit a line very easily.
As you've probably seen, Super CSV works with Readers/Writers. It might be possible to write your own Reader/Writer that wraps RandomAccessFile which could then be used by Super CSV, but it might just be simpler to make a copy.