thanks for taking a sec. I'm configuring prosites and would

Hi, thanks for taking a sec.
I'm configuring prosites and would like to customize the quotas for media as well as my other post types.
Currently they are all greyed out and say same as posts and work there way down.
Clicking on the greyed tab does not perform any action.
How can I edit the quotas for the various post types as well as media?
Thanks so much,
Yohan