Sorry Andy about deleting my original post, here's the colouring text video if you want to watch it again. CLICK.
...but Paul did suggest making an empty link to make the text go green, and that's a good way, but if you can bear going into the HTML editor to do it then it's a very simple method.
Just surround the text you want green, with anchor tags, gobbledy gơok, yes I know, but look, it's easy.
<a>This text will be green</a>
Yes, that text isn't green I know, but that's how it should look in the HTML editor, when you come out of the editor and post it, it'll be green.