I saved a file as a PDF and opened it in PDF XChange Viewer 2.0 (Build 37.2). I wanted to underline a single word and, despite this program apparently being called a 'Viewer', the tools for text formatting (and indeed other editing) all seem to be available. Somehow (I can't repeat it!) I managed to add this underline.

Why is it green and how do I change that colour to a default of black? Why is it badly positioned, instead of underneath the text? And how do I remove it? Ctrl+Z didn't work. And what exactly is the procedure for using these text formatting tools please?
Any advice would be much appreciated please.
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Terry, East Grinstead, UK