First thing I would say is don’t waste you money on that one. It’s literally just a sticker of a radianocs machine on a box, hence “symbolic” in the title.
Secondly, actual boxes are pretty easy to use. You adjust the dials using dowsing methods, with the energy you are drawing in on one plate and the target of that energy on the other.
You might be able to find more info on this thread I made: I'm building a Radionics Machine
Also JS Garret has a ton of info on radionics on his YouTube channel.