Recurring 'Mal/Phish-A" threat not cleaned up - what to do?

Hi, there -- I am new to using Sophos to scan my MacBook Air. 

I keep getting these notices that a "Mal/Phish-A" threat has been detected -- but my dashboard labels it "Threat" in orange and says "Malware not cleaned up."  I am not clear on what to do next. 

Can anyone on this forum give me concrete next steps? (Or do I need to purchase a more expensive package? :))  

Many thanks!