how do I put a link like this in a word with blue letters?

Type the text that you want to appear; select it; click the button in the LW article editor with a picture of some chain links. You'll get a popup box in which you can type the URL (and also, if you want, some "caption" text that will appear when readers hover their mouse pointer over the link).

This is completely different from how you get links in comments (text in square brackets immediately followed by URL in parentheses).