When you are in the Dope.Link homepage click on Dashboard that is shown in the top right corner of your screen. You then will be presented with a form to login. If you do not have an account yet you can simply click on Register that is shown in the bottom of the form.
You will have the option to register by manually inserting your credentials or by connecting your account with Facebook. Either method will give you the same access to the Dope.Link Platform.