Here are details:
https://www.mecabricks.com/en/forum/topic/401

In short, you can either make your model public, and then choose the "Inventory" tab in the viewer.
Alternately,

"For your own private models, use the url:
http://www.mecabricks.com/inventory/bricklink/{MODEL_ID}.zip
where MODEL_ID is the 11 chars alphacode of your model."

(Removed. All information are already here)

thanks guys!

It isn't working! I just see a blank white page. What did I do wrong?