I can't delete messages in the group wall

I can’t delete any messages at the roblox group wall, when i try to delete it, it will say

.
Pls let the low ranks delete high ranks messages because most of the posts are wardens and i am also a warden so i can’t delete posts made by wardens.

Signed,
Dd3819 - Warden

Nothing left at the group wall.

Signed,
Dd3819 (W)