How to edit the textbox?

Hi,
I am doing some edit on a project I found in Gallery, but can't do it, why?
LINK: https://gallery.appinventor.mit.edu/?galleryid=5409831506804736
what I like to do is change the '1' into 'A' see picture below. now it became to '1' as long as I modified it.
Thanks for help.
Adam

p1p

Welcome to the community. 1 is a number - block is from math blocks, so you can not add text. All you have to do is drag an empty string from text blocks and replace math block. Then add A

image

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Thank you!
have a nice day.

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