Websites are constantly in flux; links change; there is no guarantee that what you find today will still be there tomorrow. As of the creation of this course and the latest run through by us - all links are checked regularly - all of the links are good. Still, it is possible that a given link does not go where it is supposed to. In that case, please let us know via email so that we can correct/replace it, and in the meantime use the other links.
In addition, websites often rework how their pages appear, and so the sample screenshots that are included here may not look exactly like what you see when you try it out on your own. Don't panic! The functionality is most likely the same; you may just have to look around to find what you need.
Lastly, technology does not always work the way we want it to. The site that hosts this course could experience technical problems, or example. Try to ascertain what the specific problem is, then take whatever steps are necessary to move forward and resolve them.