If you want your links in WordPress to open in a new window/tab:
- Navigate to your WordPress Blog Entry or Page
- Click on the existing link or highlight the words you want to be linked
- Click on the Link Icon
- Change the Target option to: Open Link in a new window
- Click Update and then Update or Publish your blog entry/page.
To manually add the code to your HTML, use the target attribute with the value of _blank like this: <a href=”http://yourlink.com” target=”_blank“>Your Link</a>
Read more about the target attribute at W3Schools.com