To expand a little on what Noel stated using the screenshot below:
Note this is using the Firefox browser on a Windows 7 computer.. The steps may differ using a different browser or different computer operating system.
Click on the clipboard icon (inside the red box marked as "1" in the screenshot). This action transfers the specific post number to the browser address bar (inside the red box marked as "2" in the screenshot).
Click on the address bar, move your cursor all the way to the right for the end of the address.
Hold down the shift key while moving your cursor to the right to the beginning of the address. This action highlights the complete address.
Press Ctrl + C to copy the highlighted address to the Windows clipboard.
Move your cursor to the desired location and press Ctrl + V to paste the address to the desired location.