You've not told us which web browser you're using. (It makes a difference!).
However, with all major web browsers (to the best of my knowledge), you can create a desktop shortcut by making your browser less than full-screen sized. (Click the overlapping squares at the top right of your screen). Then click on the small icon immediately to the left of where it says 'www.', at the top of your screen, and (while holding the mouse button down) drag it onto your desktop.