Need Help for Firebase Cloud Messaging

Hello everyone i am trying to use Firebase Cloud Messaging but to be honest i can’t understand how to use this component for subscribe topic any anyone help me to understand this component use type

Screenshot 2022-07-06 at 11.34.31 PM

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@Avijit brother did you read this post. Even Although i comment on your shared link post and nothing get salutations. If you have block example or other share with me. Thank you for the time

Anyone can help me to understand this topic !
It’s not work

Can you share your full FCM block