How to set up Model SB220Q as a second monitor?

I am not the most computer literate person. I have a Cyberpower PC AMD Radeon RX 580 computer. When I got my computer I ordered a SB220Q monitor and it has worked great. I ordered a second one to act as a second monitor, however I have not been able to get it connected. It says no signal when turned on. I am using a VGA cable to connect it. My main monitor has a HDMI cord. I have tried a few fixes including windows P and trying to extend screen, having it detected in settings and checking my drivers for updates. Any advice is massively appreciated, thank you.