Machine IP changed

So I I swapped a modem and now my machine that runs the server and AMP has a new IP and external IP. What do I need to do in order to get it working again/re enter the new IP. I messed it up pretty bad by trying to reset ADS (I don’t fully understand what that is even) I had it semi working with the Panel, but now when I connect it is just a grey background. Any help is greatly appreciated!