You can report through contact form:
You (as a author of post) can also report to the author/company/foundation/owner of respected license e.g Creative Commons, Free Software Foundation etc. if it is a case of license violation and/or attribution.
Yes, As commented by Ankit Sharma, Visit A site (or scraper) is copying content from Stack Exchange. What do I do? for complete guideline which guides on following topics:
When should I report these sites?
When should I not report these sites?
How do I go about reporting these sites?
Please contact us directly using the on-site form. Select the "Stack Exchange content is being reproduced without attribution" option from the drop-down, and provide as much information as possible. Even if you are reporting an entire site that is scraping many questions, please provide an example of a question on their site and the corresponding question on our site, as well as any Google search terms you used that led you to finding this site. Any other information you might have can be included in the free-form text box.
I am the author of a scraped post