Hi,
Thank you for letting us know.
In such case, in order to confirm your authorship of the content, please ask your friend to make a mention about Steemit or add a hyperlink to Steemit on his blog's profile:
http://hassanagrou.com/author/hassanagrou/
You can remove this mention from your website, once we confirm the authorship.
Thank you.
More Info: Introducing Identity/Content Verification Reporting & Lookup