Format list option enables you to format the file that you have uploaded .Once you upload a file selecting the Need Formatting option then it gets stored in the Format table .To format that file you have to click on the format list icon
The format list page opens up .In this page you have to fill in the details like the Format list name, Number of fields (Eg - If you have entered only email address then the number of fields would be 1) and the separator .Click the Submit button now.
The next page would be the Format list step2 page where you would have to mention the order in which you have entered the email addresses.
Then click the Format button.