Chris Aldrich has compiled a number of resources that might be of help. Basically, you would need to:

  • Add both the IndieWeb and Webmentions Plugins.
  • Connect your Twitter account to Brid.gy.
  • Add a ‘Rel=me’ reference to the header of your blog. If you do not have a child theme you can use a Header/Footer plugin.
  • Include your blog in your bio within Twitter (which you have done).

If you are still having issues then I would recommend checking out the IndieWeb site and / or joining the IndieWeb WordPress chat.