Forum Posts with missing Edit/Delete links

Hi,

I have placed my Forum for members in a Membership protected page.

The Forum Plugin works well and fast except that members are complaining they cannot Edit nor Delete their forum posts.

I discovered that only Admin have Edit/Delete function links at each post. Other levels such as Authors, Contributors and Editors are missing these 2 important functions. I can't be giving Admin privileges to members just for that sake.

Please advice on what I can do about this.

Thanks