show a loading screen before displaying a page

is it possible to show a loading screen on my app when trying to display a web page so if the web page dosent come up i get a try again

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Are you looking for a Progress Bar perhaps Korede?      See here AI2 Progress Bar   

What you may actually want is a screen1.ErrorOcccurured block  perhaps?    It is in the Screen controls.

or possibly a WebViewer.GoHome block   on a button if the page does not load that you point to an url?

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I once prepared an example for App Inventor Classic here 

How to display a rotating waiting icon while a webpage loads

see also How to check Internet connection by Saj

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