In the Mixer (F3) can’t find any Side Chain button on the standard Compressor, to let another track feed (“side chain”) the compressor for this track.
There isn’t a side-chain option with Cubase Elements.
There may still be third party plugins that allow you a work around and you could also search the Quadro side-chain method though I’m not sure that works with Elements either (sorry).
Not your fault. thanks