How to use Malware after it picks up a threat

"Malware"? That the bad stuff itself. Do you mean? -->

Malwarebytes - There are different versions available depending upon what features you want. For a single removal without ongoing monitoring you can probably use the free version.https://www.malwarebytes.com/pricing/

I am sure there are instructions on the vendor's web site.

The problem with the so-called Mac "cleaning" applications (as well as anti-virus apps) is more often than not, they identify a valid part of the operating system, application, or documents as false threats, and attempt to remove them. There are years of posts here where problems were traced back to these classes of applications, and collectively, those of us that spend our time helping others recommend uninstalling these applications.

What we do recommend is the free Malwarebytes for Mac, which offers a 14-day realtime malware detection feature, and then afterward, it can be run interactively, or optionally subscribe for continued realtime functionality. It does one thing, hunts down real malware threats, and offers to remove them. Many of us not only recommend it, but use it ourselves — without any form of reward from the vendor.

User Guide ---> https://support.malwarebytes.com/docs/DOC-1883

Great!