How to choose between NDI inputs?

Hi everyone, I’m trying to input two different NDI video signal to my project and I’d like to choose between them to show it on a screen. How can I do this? I’d to know how can I do the same but adding an another signal by usb, like a web cam… but step by step, first I want to solve the NDI first.

Everything I have found is using only one NDI signal or usb cam but separately and I need more than one at once. I’ve just done a menu where I can choose between the different inputs but I don’t know how to connect it to these signals

Thanks everyone