The tofu is wrapped in edible tulle and placed in its press.
The plate is then affixed to the tofu and a weight placed on it to drain the residual whey from the tofu.
This gives a firm tofu, easy to fry or eat as it is.
You can also place your Japanese rice there after having garnished it with furikake or more … and thus make onigiri and oshizushi. Use the same way of pressing.

For more information, download the user manual (PDF format), tab "Attachments".