permissions for forum

hello

i've created a discussion iview using the template com.sap.km.cm.uidiscussion which seems to be the most apropriate for what i need, but i what i don't know is how to set the permissions.

i want to have two types of forum users: users only with rights to read/write

and users with full control ( who can delete topics and discussions)

in this moment all my users cand delete everything.

i've tryed to set the permissions for the folder in witch are stored the discussions ( i gave everyone the read/write permission) but it has no effect

pls help....it's urgent