Firebase data base Problem

I create this database
When someone put details then I receive but again send then changes not create new means if someone send again then change this into new .

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You need to set individual unique project bucket for each user.

Before storing data set project bucket using an unique id for the current user then store his data.

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Which word I write in project bucket ?

Anything that will be unique for each user like his/her device id or user phone number etc.