Come faccio a cerare una schermata di login con account

Nella mia app ho inserito una schermata li login solo che non so come cerare degli account, mi spiego meglio: vorrei dare una condizione alla casella di testo che se per esempio nella casella non c'è scritto 1234 premendo il pulsante x non posso accedere alla schermata.
spero di essermi spiegato bene.
grazie

Your explanation is not very clear using the translation feature...

What are you using for your login system: text file / tinydb / online database ?

Show your relevant blocks.

You can use this to go to another screen
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non so nemmeno io che blocchi usare ma vorrei che se la casella di testo non avesse scritte le cifre per esempio 1234 se si preme il pulsante x non si apra un'altro schermo

You need to learn to use Blocks to Program Your App to Make Decisions

What Blocks did you try? What you want to do is not difficult. Post your Blocks and someone will help you adjust them to your requirements Federico.

Here are some more resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.

There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro and the aia files for the projects in the book are here: http://www.appinventor.org/bookFiles

How to do a lot of basic things with App Inventor are described here: http://www.appinventor.org/content/howDoYou/eventHandling .

Also look here http://kio4.com/appinventor/index.htm and here http://www.imagnity.com/tutorial-index/ for more tutorials.

Learn about components http://ai2.appinventor.mit.edu/reference/components/

and visit the Library http://appinventor.mit.edu/explore/library Help>Library on the MENU