Enabling Thinglink for WordPress is very easy with the Plugin. The plugin is made by ThingLink together with an external developer RJW and then developed further. Go to WordPress and use the plugin directly or follow this path to enable Thinglink with the plugin:
1. Login to your WordPress account and choose plugins from the left hand side menu
2. Click on Add new and add Thinglink as a search phrase
3. Make sure that it is the newest version of the plugin and click on Install (Here it shows as Installed)
4. Activate plugin
5. Choose settings, add your Thinglink ID which you can find from here
Now you are all set. Once you browse your blog images, you will see the Thinglink icon in the left hand corner of your imges, click on that an you can edit your tags.
UPDATE: Does ThingLink work on WordPress.com?
Thinglink works with sites using WordPress.org. However, enabling Thinglink for blogs hosted on WordPress.com is unfortunately not currently possible.