When using Wecora boards for collaboration, maintaining a securely documented comment stream is a must! This being the case, you may only delete a posted comment for approximately one minute. Why so?
After that point, an email has been generated letting those you share with know about the posted comment.
If deleting was always allowed, how could commenting be used as purchase authorization and other points of documentation.
If you do need to delete comments within the allotted time: