I'm glad that people jumped in to help on this. Some folks said exactly what I was *trying* to say, but having it put in other words undoubtedly made it clearer. Others added a critical observation or two that really helped.

Opening a new browser window for the site to which you want to link is an important tip; if it's not absolutely necessary, it sure makes the process easier. From there, it's just a matter of copying and pasting (for which you can use any of several methods).

I remember being really frustrated when I first tried and failed to "make a link," and I hope this helps others get past it quicker.