If you are a beginner, you do not want to use Async functions at first.
Async programming for some people is really hard to understand, it’s a good thing to edit your Slot class to run as “Synchronous” process as well, then you slowly adapt to async mode when you feel confident.
The system assumes that you understand programming when you use Async methods, and I don’t really have time to teach how to use Unreal Engine in general.
All I can do is support with how the plugin works, but I can’t help with how to work with Unreal Engine in general.