Where is the link going to come from? This URL needs to either be entered somewhere like another field or it needs to be coded. Maybe you’re using the wrong type of field. If you want to have a link and be able to modify the link text used then this information will need to be entered. Maybe you want try a page link field https://www.advancedcustomfields.com/resources/page-link/ or a link field https://www.advancedcustomfields.com/resources/link/. But both of these will still need some coding.
