Hey if you mean how to load the extension: you do that by clicking at the bottom left in turbowarp, clicking "Custom Extension", then Text, and then you import the text you got from exporting the extension from here. Sometimes when it doesn't work you have to click run without sandbox but currently there's a bug that messes the compiling up :/
If you meant that the extension isn't showing up that means there's a bug. Right now the compiler is pretty buggy.
If you meant something else please let me know by replying to this reply.
Edit: I believe that i have fixed the compiling issue now