Members help other members with technical questions and problems using Writing.Com!
That wouldn't be up to Writing.Com. The page has been indexed by Google. You can visit https://support.google.com/websearch/answer/6349986?hl=en for information from Google about this.
At the end of the day, once something is publically available on the internet, it's very difficult to make it disappear again.
For the future, you may want to consider Access Restrictions from Writing.Com 101 . You can then set it so that only members of WdC will be able to access your content, and not the internet at large.