Even with Basic, there must be some way of deleting addressees no longer wanted.
It's odd, really. So many limitations with Basic, but it will fill in an addressee, (sometimes the wrong one), and yet you can't delete addressees no longer wanted held -- wherever they are held, because they don't appear in Contacts. (Then again, Contacts has never worked for me - and what is it 20 years with Yahoo! now?)
I have the same problem. Can add to a list, but not delete a contact from a list. Also cannot see the entire contact in order to edit it (change name, change email/phone, make notes, etc) The functionality of Yahoo contacts before was not ideal, but it was usable. The current version is not. I rely upon my lists. You have failed to provide a reasonable alternative. PLEASE REPAIR