OK, and assuming it's at detail level, it should just work. Really all you are doing is double clicking in the textbox until you get the cursor, right click and create the placeholder. When the properties screen comes up, put the first half of you expression in there and set the text colour in the font properties. Click OK to exit properties. Then do it again in the same textbox for the first name.

If you are adding the field in the expression editor I'm not sure why you would be getting the First summary appearing.