M M M at on
Currently, ABINIT cannot model species (complexes, molecular ions, etc.) that have a net charge (i. e., surplus or missing electrons); this is due to the limitation of the XYZ file format.
An easy way of fixing this would be to have a field below “Structure input” where you could specify the net charge of the structure. The default would, of course, be 0, but you could also model cations by setting a positive value, or anions by setting a negative one.