Tags are similar to categories, but they are generally used to describe your post in more detail and help group posts together.
There are 2 ways to add tags:
- When you’re in editing or updating the post itself – “Edit Post”. Tags are on the right, below the Publish button – type in the text and click “Add” for each one. “Update,” “Save Draft,” or “Publish” as necessary. See: How to Add Tags in WordPress
- In Quick Edit mode. Posts>All Posts – and mouse over the post title and click on “Quick Edit.” Enter the tags in the field separated by comma, click “Update” at lower right. See: Using the Quick Edit feature