Hi @JackieZhang ,
You can use the below logic to get the user name and then you can add your own code if you want to set it to a particular field or anything else.
var gUrl = top.location.href; //getting the URL
//fetch the parameter from url, add the replace the param_name with your parameter name.
var uName = new URLSearchParams(gUrl).get("param_name");
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