How can i prevent from a firebase value updating because of same name tag , insteaad how can i create a tag ? (THIS IS FOR CREATING AN LOGIN AND SIGNUP SCREEN)

MIT App Inventor Help
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Capture 28
HOW CAN I CREATE A NEW TAG INSTEAD OF UPDATING THE OLD TAG

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This is what you can do with the MIT FirebaseDB control Blocks.

What you do depends on whether you structure your tags as an individual item or as a list of items,

Perhaps this thread will give you some ideas Login com firebase (Salvo em listas)

or any of these similar threads https://community.appinventor.mit.edu/search?q=firebase%20login

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THIS IS FOR CREATING AN LOGIN AND SIGNUP SCREEN

You should really use firebase authentication for signups....

https://community.thunkable.com/t/firebase-authentication-v-3-0/8543?u=taifun