Adds new fields and requires new users to register additional fields (such as first name and last name) or any new field you wish to add. Note: WordP
No, there currently is no shortcode as it uses the current registration/profile actions and filters for WordPress so it shows up without the need for a shortcode.
First, you need to make sure you are allowing new users to register for your site which is found on the general settings tab on the admin dashboard under membership, make sure you have the Anyone can register checkbox checked.
Then, if you don't know where it is the registration form is on the login form, as there should be a register link at the bottom of the login form page if you are allowing anyone to sign up. Click on the register link to see the registration form and your new extra fields.