How to add notifications to nodejs app

I have a website made using nodejs ; I want it to send notifications. I’ve tried to do it using node-notifier; it didn’t do anything. I had a look at the documentation, it had a lot of words I didn’t understand. I copied and pasted the code they had given and it didn’t work. I tried replacing the placeholder values with real values but I didn’t know what to replace them with.
I’m sorry if I’m not providing enough info. But I don’t know how all this works.
Thank you very much!