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Highlight the URL, then copy it (by right clicking and hitting copy or by hitting Ctrl + C on your keyboard while the text is highlighted).
Now, go to reply in a thread. You'll notice an image with some mountains and a square over a yellow background on the formatting bar:
Click on it and a message box will pop up. You will notice that the letters and symbols "http://" are already in the text box:
Highlight the letters and symbols and then right click and hit "paste" or hit Ctrl + V on your keyboard while the letters are highlighted.
Then, press okay. And post. Ta~da!
Hope this helps