OK, your second puzzle is 20 by 20 so a bit trickier. When you've finished, you should have a nice picture of another of the sports on this site...
To complete the puzzle, use the mouse to click left for a black square, right for a white. Click again to clear any mistakes. You can also click and drag to fill in a row or column with either squares or dots. As you complete each row and column, green or red indicators will light up to let you know whether it matches the clue or not. A green light doesn't necessarily mean it's correct, but it does mean that the number of squares matches the clue. To make the display as big as possible, just maximize your browser window or use full-screen viewing mode.
If you've cracked this puzzle, you're no doubt itching for another one, so have a go of the slightly bigger third one.