Mail Shield ~ Avast free anti-virus for Mac

Can anyone tell what to do, if anything, about a couple of threats showing in Mail Shields ‘History’. Right clicking on them doesn’t give any removal options. There have also been a couple of orange alert boxes on the desktop warning about these emails. Any help gratefully accepted
Thanks
Alan

Best to post this on the avast! for Mac sub-forum.

I’ve just posted in the one you suggest
Many thanks

You’re welcome.