To create your account so that you can post ads for free, look near the top left of the screen.  In the light green bar all the way on the left are the choices "login" and "register";  simply click "register" and begin filling in the very short form.

You will be asked for your
  • first name
  • last name
  • email address
  • select a username
  • enter a password
  • enter the password again to be sure you typed it correctly
  • a security question
  • and an answer to your security question

Other than your username, none of this information is visible to any visitors to the site. 

The "security question" will be used if you forget your password.  If you are trying to log in and cannot remember your password, click the link that says "Forgot Password".   The website will then ask your security question and you must answer it exactly as you typed it when you registered.  Then the website will mail a new password to you at the email address you provided when you registered.