How can I use a module from a form

You don't.
A console app is just that: an application which runs in a console, gets a set of startline parameters, and can read and write text to the console. It isn't something you can "embed" in your Forms application easily, because a Forms application doesn't have a console!

You can execute your app from within your form: [^] Or you can reference your app EXE file by right clicking "References" under your project in the Solution Explorer pane, and sellecting "Add a reference". You can then Import the assembly namespace(s) into your project files as needed: References and the Imports Statement (Visual Basic) | Microsoft Docs[^]
You can then use the classes in the EXE (provided they don't need to interact with the console).