How do you open scripts using C#???!!!

Hi. I just started unity and was watching a tutorial on youtube to making a UFO game and I was at a part where I was going into a script, but it wouldn’t open! I tried doing every way you could open a script. But every way I try it says “Unabled to open Assets/Completed/PlayerController2.cs:Check external application preferences.” What do I do?! @UltraVDO

That means you don’t have a linked editor, you should reinstall unity with visual studio tools or check in you editor preferences that MonoDevelop is well installed.

Or you can open the script outside from unity…