After removing the case from its packaging, separate the parts. 

Place the Raspberry Pi board into the base section of the case, as shown in the video.

Centre the mid secton of the case over the board and base, push down engaging the clips around the sides of the mid section.

Finally place the lid on the top ensuring the orientation is correct, appy light pressure to the lid. There are no clips on the lid, it is held in place with friction, putting too much pressure on the lid might cause damage.