1. From your dashboard, go to the Appearance > Customize >Side Identity Sections 

2. Now click on the Select Logo and add the Logo

3. Now click on the Site Title and add The Site Title

4. Now click on the Tagline and add the Tagline

5. Now check the Display Site Title and Tagline checkbox to show The Site Title and Tagline

6. Now click on Logo Width and set logo width

7. Select the Site Icon 

8. Hit on the Publish

9. See Live Preview:-