How to install second monitor?

Good day!
I worked with one monitor connected with HDMI, and now I connect another one to graphic card through VGA.
Display settings window show me that VGA-0 is connected and HDMI-0 is connected, and when I change one setting the second changes to, but newest monitor displayed “no signal” window.
How to set second monitor?

Video card and driver ???

Problem was solved. Thnx for reply.

And what did you do to resolve the issue???