Start by logging in to your account. Click on your name which is located in the same place, then My Account which will lead you to a page summarizing all the information you have given.
Click on the Membership tab which will lead you to a page that summarizes all the information about your membership. Just underneath that tab, click My networks and then click Join A Local Network.
You will be asked some questions regarding your geographical location and special interest groups. If you are having trouble working out which 'geographical network' you are in, please click here to see our network map.