First, to tag a blog post by a person you have to have people in the Platform. See our Guide on how to add Staff & People profiles for how to do that.
Why Tag A Person?
When you tag a person to a blog post it will automatically display on that person's profile page. This is a great way to build dynamic profile pages.
Tagging A Blog By A Persons
On the blog post, scroll down until you see the People Section.
Start typing the person's name and the system with autocomplete it for you.
You can tag a post by as many People as you'd like.
Click Save or Publish