To set breadcrumb, you have to install Yoast SEO plugin to be able to use the breadcrumb for website.

Download plugin:​

Step 1: Go to WordPress Dashboard > SEO > Search Appearance

Step 2: Choose Breadcrumbs tab > Enable Breadcrumbs

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Separator between breadcrumbs:

Step 2: Then "Save" the changes

Step 3: Go to WordPress Dashboard > Templates > Header

Step 4: You can drag 2 widgets Page Title and Breadcrumbs

After all, click "Update" for settings.