Confused - Joomla 2.5 ACL Settings for Group - Joomla! Forum - community, help and support

i'm trying set user group edit articles, not of articles in backend.

i have group has administrator parent (group - mem admin). have set following in user groups options:
configure: denied
access admin interface: allowed
create: inherited (allowed)
delete: inherited (allowed)
edit: inherited (allowed)
edit state: inherited (allowed)

this user group allowed edit of members in user manager.

as articles, want them edit articles under category have created called 'members' , not of other categories have created.

when log out test this, mem admin has access edit of articles in categories.

thank help!
how can make more specific?

• set new user group's privileges original settings.
• set parent of new user group 'registered'.
• in access/view level registered , special make sure new user group allowed.
• in global configuration set following 'allowed' new user group
  
  site login
  admin login
  all rest should 'inherited'(which should default deny)
  
• in content >>> article manager >>> options ... permisions tab ... set access administration interface 'allowed' new user group. rest should 'inherited'(which should default deny)
• then either in each category or each article permissions 'allow' new user group.
  this structure comes play. if have structured categories , articles correctly ... need set permissions in categories apply. other wise need individual articles.

doing way allow members of new user group access admin see content menu. , not able create, edit etc. unless have specified in category or article.