There should be groups and quotas in that list, make sure your selecting the quota and not the group. And yes, it should work that way... selecting the quota will allow them to see that form field.
You might also try deleting the files in your data/cache/YOUR ACTIVE SKIN and in the data/cache/jrCore directories.
updated by @douglas: 09/10/14 04:51:45AM
Yeah, that is coming from oneall... you may need to contact oneall on how to modify those buttons. I'm not seeing any instructions on their site either.