Add Page Links to External Site

You could custom edit the sidebar.php to manually insert an extra link at the beginning or the end of the list. But I personally wouldn’t recommend doing that. The whole point of that block of navigation links is that it’s to pages on your domain.

If you install widgets, you can easily create extra block of links etc. that will appear in your sidebar.

Does this plug in work with the current wordpress version?

The only reason I asked was because it was made over a year ago and being a newb to this platform, I was not sure. No need to get your panties in a bunch.