You will receive an email alert when a journalist sends you a message through BowerBird. This email will say who the journalist is, and which publication/s they work for. You will need to click the dedicated 'Reply' button within the email (you cannot reply directly in your own email client).
When logging into BowerBird, you will see new messages on the top-right-hand side of the menu:
There is currently no way to freely contact other users without an active BowerKit.