Now let me see if I can explain this in the most simple way. Take 2 crates place them end to end , so now you have crate 1 and crate 2. Take 2 rugs and place them end to end I numbered them 1 and 2. Pick up rug 1 and place it on crate 1. The image should look like above image.
Now to separate them Click on crate 1 and move it backwards , will look like image below. Now place crate 1 with rug 1 on top of the crate with no number, should look like second image below.
Okay were set for the fun parts. Take one rug ( I use the small blue trimmed rug ) and place the board on top of it as it image above. Click on the rug and move it up onto rug number 1 on the crate stack. Once it sits flush you're ready. (Images below).