Click on "Contacts" and go to your "Main" contact folder. Click on it and this will show your "Groups". Click on the Group you want to edit. Select the box next to the contact you want to delete then click on "More" and select delete or once you have selected the contact hover over the contact and you will reveal icons at the right hand side. Click on the "Delete Contact" bib icon.
Both the above methods only delete the contact from your group and not from your Main contacts list.
