How do I Edit a Script?

I know how to make a script, and I've been trying to follow the tutorials, but Unity won't let me edit it. Is there a separate program that I need? I've looked everywhere and I couldn't find one.

 

When installing Unity, one of the options is to install Visual Studio 2019 Community Edition as well.
VS is the default code editor that Unity supports, but there are others as well.

You can download VS Community separately from here:
https://visualstudio.microsoft.com/

 

What do you mean by this? If you're referring to the text field in the Inspector being read only then that's because it's just a preview, because good code editing tools are quite complex.

Yes. As @Vryken said, Visual Studio is installed with Unity by default, but it can also use other code editors. But you don't have to open that editor manually. Double-click on your script file in the Project panel and Unity will open the appropriate editor for you.

 

Thank you for your help!

 

Technically cs files are just text files. So you could use plain old Windows Notepad, though it would be a terrible experience. Use VS unless you have a specific reason to use something else.