You should search first the forum - there are various posts on this topic. See:
In short: you will have to renumber your homo-dimer to avoid overalap in residue numbering, give it a unique chainID/segID and use that as input for your docking
You should search first the forum - there are various posts on this topic. See:
In short: you will have to renumber your homo-dimer to avoid overalap in residue numbering, give it a unique chainID/segID and use that as input for your docking