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Create a title for your post and add a description within the post field.
Scroll down to the Post Thumbnail Options box within the post editor.
Paste the URL to any image on the web, or click Select Image to select the thumbnail image you wish to use for your post.
Click Update Post to save your options and wait for the page to reload.
After the page loads, you should see a preview of your thumbnail.

Trackbacks are a way to notify legacy blog systems that you’ve linked to them. If you link other WordPress blogs they’ll be notified automatically using pingbacks, no other action necessary.