I have tried, twice, today to point a user to a useful link. The first try was a disaster I own. The second: I opened a new post in the current topic, then (through a new window) opened the post I wanted to link, hit permalink on the originating post (I wanted to link the whole thread), and then used copy and paste . . . up there . . . at the top where an 'address' resides. There was a pop-up blocked message at the time of permalink, which I am trained to ignore, so I suspect I copied the wrong URL?
When I went back to the post I wanted, I tabbed down below my written message, and then used C&P to provide the link. The URL was then displayed three characters into the message I had already typed over the space I meant for the URL to land. I then used C&P to move the URL down to where I wanted it. I hit 'reply', and then got a rather endless 'processing-whirly-icon' that lasted for several minutes. I stopped the action and refreshed, and the whole lapsed-Ludite mess just vanished.
I am gifted in many areas, but I know see this is not one. Feel free to talk to me as if I am a small child.