I just started a group on yahoo. for my nursing cl. i would like for all members to have free reign to edit

i want all members to be able to add to and delete from page, like we were all managers or moderators, how can i set up my group so that it is like that? so that all members can delete or add pics, add or delete links, add or delete from calender, is it possible to have a group so that all members are moderators? help me figure out how to do this