go into the package manager and see if

[earnest sparrow]

how do i need to refrence that?

[raw gate]

are you using assembly definitions in your project?

[earnest sparrow]

yes for testing (but i only created the file)

[raw gate]

then you need to familiarize yourself with how they work.
https://docs.unity3d.com/Manual/ScriptCompilationAssemblyDefinitionFiles.html

[earnest sparrow]

thx ill try