It's got an input and an output. You can offload stuff for storage and later pickup onto the waystation, and can pick up stuff with another ship later, if need be. They're meant to be easily assembled waystations.

How can I pick up cargo? Or can I trade?

How do you mean?

How can I interact with it?

I wouldn't call it tough :P

It's at least meant to sit there for extended periods :P