Attached is screen print of the form presented when "New Ticket" is selected. (I'm using the latest stable version)
Note that the verbiage of the help does not match up with the "Ticket Visibilty" type shown.
Ticket Visbility defaults to "Public" yet this is the verbiage of the text that appears...
This is a private ticket. Only you and the support staff will be able to see its contents. It is safe to include usernames, passwords or any other sensitive information. It will cost you no credits.