I cannot manually cleanup detected threats

I ran the Sophos for Mac Home edition v 9.0.3 on a macbook pro running 10.6.8.  It found 3 threats which I asked it to cleanup.  Cleanup failed.  In the details area it said to cleanup manually.  Doing that seems to involve running a custom scan but I have not been able to make that work.  I cannot get the threat name to stay in the custom scan area whether I have added a scan or not - I drag it in and it bounces back.  Additionally, the "path and file name" line isn't live so clicking on it does no good - it won't drag.  I have read and reread the instructions but can't figure out what I am missing.