Change export value based on text field

There is no single function for setting a list item value, so assuming the item index is known, the script will need to acquire the current item "Name", delete the item, and then insert the new item using the acquired name and index.

Here's an example, it replaced the export value of the currently selected item.  The script is written for a button. You should run it first from the console window to make sure it works.

var cNewVal = this.getField("TextField").valueAsString();

var oListField = this.getField("ListField");

if(oNewValue.length)

{

    var nIdx = oListField.currentValueIndices[0];

    var strName = oListField.getItemAt(nIdx,false);

    oListField.deleteItemAt(nIdx);

     oListField.insertItemAt(strName,cNewVal,nIdx);

}

So you want to add entries to a list?  Or change the export value of an existing entry?

The article I linked provides a perfect example for adding emails to a list.