How to send commands to Russound MBX PRE through Rio?

I installed the player using this configuration - Russound RIO - Home Assistant. I see the entity showing in Home Assistant. It is showing minimal information such as song playing, etc. My question is how do I send RIO commands to it? I am familiar with RIO as I have them setup in another platform but I am not that familiar with Home Assistant and couldn’t figure out how to send commands to it? also it puts out a constant stream of data on playback status etc. How do I capture this and process it? Thanks for any help.