If you need to make a lot of different edits to your users all at once, you can accomplish it fairly easily using an export of your users.

If you have just downloaded a compressed export of your users from your website, you will first need to extract it.

After you've extracted it, you can then open the spreadsheet. Across the top row, there will be column headers. Here's an explanation into what each of those mean:

Any of the information contained in any of these columns, you can now edit. Once you have finished editing, please save and send the sheet back to us, so we can import it onto your site for you.