From your Member's Centre Dashboard, find the section on the left hand side labelled 'Your Preferences', and click on it to expand the menu. 

Click on 'Email Subscriptions'

Click the red 'Unsubscribe All' button, or select the individual mailing lists you would like to unsubscribe from. Some mailing lists can only be unsubscribed from manually, as the emails may contain important information concerning your listing. 

After you have selected which mailing lists you do not wish to be subscribed to, press the green save button at the top of the page to save your preferences.