From the Allow User Registration field, select Yes.
Click Save & Close.
Make sure the Login module is published or that you have a menu link of the type Registration Form.
From the front end of your website, click the registration link to display the Joomla Registration Form. You should see the extra fields displayed in the form.
If you want to change the field names, use the Joomla Language Manager and enter the Language Constant and value; for example: PLG_USER_PROFILE_FIELD_ADDRESS1_LABEL=”Address 1:” You can find all the Language Constants / Field names in the following file: /administrator/language/en-GB/en-GB.plg_user_profile.ini
To access the Joomla Language Manager, from the Joomla Admin menu select Extensions > Language Manager.