Name Personalisation: variable

I've entered a text box and created the username variable, but when I publish the lesson, the variable shows up in the text box. Do I need to change the name of the variable to First Name or is there a way for the variable not to show in the text box? Of course, I've already placed the variable on several slides. :-( 

I've included an attachment to show how I'm using it. 

 

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