Please point me to the proper setup Assistant Relay

hey everyone. ive been beating my head against a wall, and i just figured i might as well ask here.

I want to have a button that tells a specific google device to play white noise. Its for my kids room. I have a button that sets all the lights the way i want, and all i'm missing is it triggering his google to play white noise. Do i need assistant relay for this? is there a way to send a command to google via hubitat that can just trigger a routine i've already made? i tried to follow the instructions above, but it looks like Rule Machine has changed since SmartHomePrimer's detailed instructions, as i dont see actuator.

any help?