If you need to display the values in the front-end means
take a look http://www.advancedcustomfields.com/resources/displaying-custom-field-values-in-your-theme/
Or if you want create front-end submission means you should create a page first using acf_form_head() and acf_form()
take a look
http://www.advancedcustomfields.com/resources/create-a-front-end-form/