Choose Contact support in the account menu, or on the More screen in the mobile app. It opens your conversation with Magpie support, listed under Support in Chat in every team.
There is one conversation, so earlier questions and answers stay above the new one. Anyone on the Magpie team can reply, and their messages carry a Magpie label that no one else can use. Attach screenshots and files as in any conversation; replies arrive like any other message, including as a notification in the mobile app.
If you cannot sign in, the Contact form in the site footer still works.