I can't update data from firebase because of the random given character

Question

Here is my firebase i don't know how to enter or get that path in firebase and i want to change the password inside that random character

Answer 1

To update a specific value in the database, you must know the full path to that value.

If you know the email address, but not the key that email address, you can use a query to look up all child nodes of users with that email address.

let query = firebase.database.ref("users").orderByChild("email").equalTo("gagfa@john.com");

Then you can load the data matching this query, iterate over the results (as there can be multiple) and update the property:

query.once("value").then((snapshot) => {
  snapshot.forEach((userSnapshot) => {
    userSnapshot.ref.child("password").set("CorrectHorseBatteryStaple");
  });
});

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Unrelated to your question, but please read Why are plain text passwords bad, and how do I convince my boss that his treasured websites are in jeopardy? and reconsider storing passwords in plain text.