You then launch the Disavow tool.

And Upload your file. 

Making sure backlinks to your site are high-quality, and follow Google’s rules, is an essential aspect of website administration for SEO. 

Have you audited your backlinks recently? If you haven’t, you should, and soon. Have you gotten a link related notice of manual action on your site in Google Search Console? If you have, follow the tips in this article to resolve the issue or disavow the link.