You can change copyright text. The copyright notice also tells site visitors who own the website, though it sometimes also includes information about the company that developed the site or the template the site owner used.
1. How to change Copyright Text?
Go to => Appearance => Customize => Footer Copyright Settings
Here you can find Copyright text input field, Enter your text here then Save & Publish and If you want to hide this text using Hide Copyright Text. See refer attach screenshot.
2. How to manage Social Icon in Footer?
Go to => Appearance => Customize => Footer Copyright Settings => Social Link
In this tab you can see Social URL input field and check open new tab/window setting. You can change according to you. See refer attach screenshot.