i know how to double knit.. but i don't understand your question.
can you give a link to an image? or a link to a url (directions or image or both?
most double knit charts only show one side and in order to have a 2 sided design, you work the pattern chart (k X with white (and unstated/unshow, but implied, P an equal number of X with CC) then KXX with CC (and again unstated, PXX with white. )
this results in a positive pattern on side A (a white square with a big red heart) and a 'negative pattern on side B (a red square with a big white heart)