Place the design onto your material using the camera feature on the programme. Once happy ensure that the sizing is correct you for. I have used 4mm thick material so please be aware of this when using a different thickness of material. Check that  it will work. Otherwise you will need to find a way to adapt the slot cutouts. I'm sure 3mm would work fine with this design. 

If the cutout parts don't naturally fall out use a weeding tool to carefully remove them. Remember that the design is fragile!

Carefully slot the top to the bottom until it is in line and able to stand independently.