Social Icon Setting
Location of the social icon settings are at the customize page (Dashboard – > Appearance – > Customize). In the available fields of social account fill with your account link address. You can only enter a domain name and your profile page, for example wordpress.org/profile/jempol/, or fill it with a protocol services, such as http: // or https: //.
In the last column is the feed field. For this one icon you can just fill it with / feed. Systematically, the icon will appear like this namadomain.com/feed.