2: If it's a link, just click on it, if it's an item you are wearing or being sold, etc, right-click on it and hold the mouse button for a bit. If you want the item display window to stay up, after it appears and while still holding down the right-mouse button, move the mouse a bit.
1: Type what you want in the chat bar, upto the point you want the link, then click on the icon of the item, in the item display window, then finish anything you want after the item in the chat bar.
Yther Ore.