I followed the instructions in this post to try and delete a message and attachment https://confluence.atlassian.com/hipchat/delete-messages-and-files-751698289.html
However, the delete+message.png icon in step 5 under the heading "Deleting messages and files shared in 1-to-1 chats" does not appear in the interface when I hover over the message, so I am unable to get the message to delete.
Yes, that means you're an admin.
I see you're referring to 1-1 chat messages. Admins can delete messages shared in rooms, but not 1-1 chats. You can delete your own 1-1 chat messages, but not other people's 1-1 chat messages.
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