If you want to know trackback url of your wordpress blog article, you can do as follow:
Step 1: Login into your wordpress blog dashboard
You should login into your wordpress so that you can set some functions and edit your wordpress theme.
Step 2: Set your wordpress to allow trackback
You shoud allow link notifications from other blogs in your wordpress blog.
Step 3: Edit your theme page
Click Appearance >Editor to open theme edit page.
Step 4: Click Single Post
Click Single Post to start edit theme single page.
Step 5: Add <?php trackback_url();?> in this page
You can add below code in this file.
<p>Trackback URL <?php trackback_url(); ?></p>
After you have added, you can save this file.
Step 6: View one post
You can click to view one post, then you can view trackback url of this article.