Some help needed with uq

MIT App Inventor Help
1

Hello I have a little isue I sent uart write string from microbit "s" a lettre s
In appinventor I revieve [102] so that all oke but now I want that this [102] start something.
And I am lost how do do this
Here is what i have tried

Please some help advice needed

Thank you all

Sander

2

Please post original png uploads here, like
download

3

P.S. What is the difference between Label2 and Label7 ?