Java output

Sup, noob here needed help from the programming jobs.
I am using java (in before shit) to do some calculations and I have a button giving me an output.
outputLabel.setText("Your Speed in MPH from FPS is " + round(mph, 1));
I have this output, but I need it to give me another output similar to it. I am having trouble doing this, when I put in similar code it will give me the output to the first one I put in, instead of both.

Also if it means anything
Button calcButton =  new Button("Calculate in Mph from FPS");
Label outputLabel =  new Label("Click the Calculate button to see your rockets speed.");

Thanks, maybe

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