Members that have a 'Get Hired" account can only flag their interest to a job posting, and can not send messages to employers unless an employer initiates conversation with crew first. This is to make sure that hiring members aren't inundated with email.
Employers are able to see a list of who has expressed interest in each of their posted jobs, and they also receive a weekly email reminding summarizing that information.
If a 'Hiring' member (someone who has posted a job) messages you, you will have the option to accept or reject the message. If you decide to accept, you will be able to send messages back and forth with the employer unless the employer closes the 'Messages Thread'. If a 'Message Thread' is closed, you will no longer be able to send the employer messages.