It looks like there's a problem with the https://dovetailgames.freshdesk.com/support/login page. After login there's a message: "Portal is currently not accessible" and the login mask is still there although I am logged in. Any other link for the gameplay guides ?
Dovetail Support has moved. Now, you can find us here: https://support.dovetailgames.com/hc/en-us or via the link at the top of the page.