You will have to just add cream after you brew your cup. The Reusable Capsule for Dolce Gusto Brewers does not hold the cream (because there are holes in the bottom) so you can not use that for cream.
FAQ for Dolce Gusto ® BrewersRSS
What brewers will the capsules work in?
These refillable reusable capsules can be used with compatible Dolce Gusto ® brewers. This includes DeLonghi Creativa, DeLonghi Genio, DeLonghi Circolo, Melody2, and Krup's.