Why is text not mirrored in Texbox?

Hello, I’m sure the commands are correct, the text or number I wrote in texbox does not appear in firebase.

Not at all. You set the variable on screen initialisation while the textbox text empty that’s why the firebase not storing your textbox as the global variable has not updated to the new textbox value.
You need to update the variable value when the button is clicked.
for simple ex, Initialise the global bir to empty string and move the join block to set global bir in button click event.

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Thank you very much indeed. Resources in my language are very few. I’m trying to learn.

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