This is basically trial and error to try to fill in the blanks in the clue beneath the image.

1. Any symbol is correct if it is above a black circle.
2. Any symbol is correct if it is to the left of a white circle.
3. Base-down triangle is always correct when present.
4. Cross is correct if there is a square in the constellation.
5. Diamond is correct if it is white.
6. Base-up triangle is correct if there is a plus with opposite color in the constellation.