To generate a key you we need to verify you're an owner of the website.

To do that you need:

1. On the website (or blog) create a page with URL ending graddittoken.html.
   It's acceptable to have URL ending graddittoken_anytext.html.
   Examples: http://fruitfulbookmarks-en.blogspot.com/p/graddittoken.html или http://fruitfulbookmarks-en.blogspot.com/p/graddittoken_7469.html.
   For Blogger: how to create a static page in Blogger. To get page URL containing "graddittoken" make "graddittoken" the subject of the page.
2. HTML of this page should contain the following text:
   
3. Put URL of that page here:
4. Press the button