Onesignal plugin - how to send notificaitons to individuals?

I want to send notifications to individuals, and I installed the Onesignal plugin.

I think I’ve done all of the required settings for using onesignal plugin.

I saw above two manuals and I finished all steps, and finally I can receive this notification prompt.
However, even though I clicked the button subscribe, I think there’s no subscriber when I checked it on onesignal site.

Also, I can’t receive any notifications.

I’m curious about what to put on the user box.
I don’t have any user id or player id.
I need your help.
Please let me know what I can do to send notifications.
Thank you :slight_smile:

I think you can go to the forum post below to see if any user have answered the similar question. I can see there are many replies and some of them are about user registration. Hope this help!

Samson @ Plugin Developer