Connecting case and cooler RGB to motherboard.

I got the following build

https://uk.pcpartpicker.com/list/bfgD8Z

I managed to connect the lights for the cooler into the ADD_GEN2 port of the motherboard.

The problem is that now im trying to connect the lights for the case itself and I don’t know where I can connect it as I don’t see another ADD_GEN2 port.

Am I supposed to buy something where I can connect both RGB from the same port? Or am I supposed to connect them somehow to the back of the case?