WordPress has the ability to assign custom fields to a post. Each custom field is handled with key/value pairs. The key is the name of the custom field. The value is the information that you want to store in that custom field.
To add a new custom field to a WordPress post, you need to edit the post.
In the post editing page:
- scroll down to the area titled Custom Fields
- enter name and value of the custom field to the Name and Value columns
- click Add Custom Field button to save this custom field
If this is the first custom field on your WordPress site, you might need to click “Enter new” link to start adding the new custom field.
# There is no Custom Fields area
If you can’t see Custom Fields area, please:
+ click on Screen Options tab at top right corner of the page
+ select the Custom Fields checkbox in the expanded area:
If you can’t see the Custom Fields option, the possible reason is the post type doesn’t support custom field.
To add a new custom field for this post type, you can install a custom field plugin (for example: Advanced Custom Fields), it will help you to add a custom field to any post types easily.
After adding custom field, you can show custom field easily (read more)