Folder Permission

Dear All,

                  I am very new to this device, please help me in assigning the folder permission.

1) I am unable to edit the folder permissions for sub folders, infact there is no option to do it.

2) I want to assign delete permission to be restricted but they must rename the floders (usually which is not possible in windows).

3) I have integrated AD but I am unable to assign user vise permission.

Please assist me in above all my queries..