Setting permission for discussion board

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Hi guys,

The SharePoint is new to me. I just installed SharePoint Portal Server
2003, and set up a discussion board. The default permission setting of
the discussion board allow "User A" to edit/delete any message on the
board, including those that are not created by "User A". So I went
into "Site Settings|Manage security and additional settings|Manage Site
Groups" and created a new group with custom rights. But I couldn't
find the the right that allow to a user to access to discussion board,
but at the same time can't edit/delete others' messages. Could
somebody help me out on this one?

Thanks.

Izabella

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