I've searched for answers on this but what I have found was either not quite on point or several years old, so I thought I'd check again.
I have an event set up where participants could register themselves plus additional participants. One registrant missed the option to add additional people and only registered herself, and wants my help registering her husband. But I can't see how to add participants manually on my end. "Change selections" doesn't allow me to change the quantity of registrations. (This was a credit card registration).
Is this a thing that can be done or not? Or am I looking in the wrong place?