How do I get this off my computer?

Malwarebytes has an excellent reputation on this forum. If you want to uninstall it, see the instructions in https://support.malwarebytes.com/hc/en-us/articles/360039025233-Uninstall-Malwarebytes-for-Mac

Not sure why you would want to remove Malwarebytes for Mac as it has proven to be a reliable program, but to manually remove all of it, this is where it is "hiding" on your Mac:

• Launch Agents
  • Location: /Library/LaunchAgents/
  • com.malwarebytes.mbam.frontend.agent.plist

• Launch Daemons
  • Location: /Library/LaunchDaemons
  • com.malwarebytes.mbam.rtprotection.daemon.plist
  • com.malwarebytes.mbam.settings.daemon.plist
  • com.malwarebytes.HelperTool.plist