Site Title and Parent Site Title
The Site Title is used to communicate the name of the site to users. The Parent Site Title is the site's parent organization or main affiliation.
Forward to 5:36 for information on the Titles.
 Instructions
Add/modify the Site Title and Parent Site Title:
Go to Appearance > Customize
Click on Title Bar
Add or Modify the Site Title
Add Parent Site Title and Parent Site Link
Click on Publish
Close Customization window
Review the Brand Standards on Appearance>Site Identity