Trading Signals

 
(a) If a Symbol is not opened in my chat, and my signal provider trades on it, will the Terminal be sensitive enough to automatically open the trade?
(b) After configuring my Signal settings, and lunching it in a VPS, can I change any of the settings again?
 
By use of signal service, trades are opened automatically without open any chart but if you attach an expert then you have to open the chart
 

For VPS, according to my knowledge, you dont need to adjust settings again

for more details please read

https://www.mql5.com/en/vps/tutorial 

Virtual hosting in MetaTrader 4 and MetaTrader 5: How it works
Virtual hosting in MetaTrader 4 and MetaTrader 5: How it works
  • www.mql5.com
The virtual hosting service allows creating a copy of your trading platform on a remote server. Run your trading robots and copy deals of professional signal providers on a virtual platform 24 hours a day.