Dear christianF-2,
1) Please check the file attached to see whee the option is.
2) Very good.
3) As normal categories are, custom taxonomies terms are listed in the menu "NAME OF THE TAXONOMY", under the post_type menu the taxonomy belongs to.
See in the second screenshot the example with default post type "post" ad default taxonomy "categories" – look where the mouse pointer is in the scrrenshot. Go in the corresponding page f your taxonomy and delete the term.
Please let me know if there is anything else that I can assist you with.