Step 1: Log into your Drupal 8 administrative dashboard.
Step 2: Select Menu from the top menu bar.
Step 3: Next, click on Appearance from the secondary menu that appears.
Step 4: You are now taken to the main Appearance screen. This is a list of avaialble themes. Look to the upper right corner of the screen and you will see a Settings tab.
Step 5: Click on the Settings tab to continue.
Step 6: This brings you to the Appearance settings page. Note that the main page is Global settings, so adjusting settings here affects all themes. If you wish to adjust these settings for any individual themes, you will need to select them in the upper right corner.