Create logged in session

So I am new in Mit App Inventor, before this I usually create a web-based application. Can anyone help me on making a session which only allowed logged in user to access the page.

The picture shown was a coding I use for my web-based project in order to make only logged in user to access the system . Do you know how can I make a similar function that only allowed logged in user to use the system.

This possibly might help

Try this advice https://steemit.com/utopian-io/@faisalamin/how-to-develop-login-system-app-with-mit-app-inventor-2

or A login template by eiXerITS

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