I think you are thinking of the phrase  the other way around , which does essentially mean the opposite, but in a specific way. The specific nature of the other way around is that it means that doing what you say in the opposite direction is correct, not necessarily the exact opposite.
You can offer your kitten either dry food, canned food, or both. Be sure to choose food which is designed for kittens. They require a diet which is especially rich in protein, calcium, and other nutrients. Cat food that is for adults is not sufficient.
She will continue nursing them for several more weeks as she gradually increases her time away from the litter until she completely weans them at around 8 weeks of age. Feeding the kitties all the solids they'll eat after the kittens are 3 weeks old complements Mama's efforts nicely. Offer canned kitten food or dampen a handful of dry kibble with warm water in a shallow pan and prepare to be entertained.