impossible - click on blank space on tree node rectangle of person or their photo to reveal side panel then click more and select delete -- never works for me ... or go to their profile page click actions then delete profile -- again never works for me ---- or if that person has other relatives attached which they they do - namely all of my realtives -- you need to delete all the attached relatives which then makes your error person removeable --- what the !! there must be a simple way - the person entered is wrong they should be deleable easily !!!
