You can login using the credentials(email and password) entered when you Registed or use your social login
(for Facebook or Google).
Using social login will redirect you to their site for adding credentials and then return you to this site.
This form also has links to Register or Forgot Password forms.

Once authenticated you are redirected to the home page of the intranet site.
The top navigational menu will show:

Click on your name to manage your account profile.