I don't know, how it is done officially.
If i want to help a certain person I think of him/her while meditating - imagine the benefit as light and think how this light, coming from the Buddhas, helps the person. And i dedicate the merits afterwards "to this person and to all sentient beings, who are not this person." In this way the persons name is called out twice.
When i'm able to conceive the person and the benefit he/she will receive with full heart, there is always some benefit.
But I learned: better not talk about it, because that weakens the process.