Pop-up Window

Hello falks, I’m french, so sorry for English…

So I’m a rookie on Unity and I have one question :

I want to create a pop-up window which we could clic on a URL link who could give us a material pack or anything else. I have already watch tutorials on unity website and french forums, but I don’t really understand how should I do that.

Could you help me please?

Thanks !

Up !