Your site title & tagline are the bit of text that is appearing in your site’s header area. 4 easy steps to change your site title & tagline. From your WordPress dashboard:
Step 1 – Navigate to Appearance > Customize
Step 2 – Click on Site Identity
Step 3 – Site Title and Tagline are just under Select Logo. Enter your own text
Step 4 – Click Save & Publish (blue button on the top)