Hi Max and Tony, sorry to hear that the Roster Edit Type feature is not working. I'd be glad to help fix this.
Jason is right, just below the Submit Changes and Cancel buttons should be the Roster Edit Type option.
When you change this option, the Submit Changes button should turn yellow. You need to hit the Submit Changes button in order to make the change stick.
I tested the features and confirmed successful changes in both IE9 and Firefox 13. Older browsers, especially outdated/unsupported ones are often the culprit when a feature does not work as intended. Check for browser updates, or try an alternative one that is updated.
If your browser is updated, and you still cannot change the option, let me know what browser you used initially, and the version number. I'll work to reproduce the issue, and if I can, push it up to engineering for a look.