Did the cradle come with the two clips that go onto the front lip of the cabinet? (Please say yes)
Once you get the cradle installed, you can lower the machine just like you would lower a machine that doesn't use the cradle. It stays in the cradle and folds down and the extensions on the table fold over the top.
If you need it, I will take some pictures of how the clips are installed. You will put the cradle onto the hinge pins first, as if it's a machine. That will give you a guide for installing the clips.