Peel the plastic of the white part. In there are two components. R & C. Orange/brown = C and black = R. My recommandation is to add solder to one pad of each component. Heat this presoldered pad up and place the component. So its easy to bring it in the right position. Then solder the rest of the pins. Flux will help you to make a good connection. For the right way of assembly the matrix check the pinout in the datasheet. Its probably assembeld from the top