“edit” picks atoms or a bond for editing.

edit selection1 [, selection2 [, selection3 [, selection4 [, pkresi [, pkbond ]]]]]

If only one selection is provided, an atom is picked.

If two selections are provided, the bond between them is picked (by default, if one exists).

unpick | remove_picked | cycle_valence | torsion | cmd.edit | commands