I need help with the username

MIT App Inventor Help
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How do I make it so my app won't start unless the person enters a username?

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You can do something like this:

blocks (3)

If the user has entered a username, this returns true.

blocks (4)
blocks (4)946×372 46.9 KB

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If (Not (is empty (text1. Text)))
Then...

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Thank you so much for the help

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