<p>You cannot create your own tags, even on your own questions, until your reputation is >300 (see <a href="https://stats.stackexchange.com/help/privileges/create-tags">privileges: create tags</a>).  Since it is your own question, and seems relevant, I edited your post to create the tag for you.  Be aware that, as noted on the help center page:  </p>

<blockquote>
  <p>new tags will be automatically culled and removed from the system if they are not used by at least 1 other question in a 6 month period</p>
</blockquote>
