number of posts

I made a website a while back with wordpress. I have a homepage https://www.humanistaidindia.org where I want to show a maximum of 4 posts. I don’t know how to get this to work. I changed the number of posts to show to 4, but it didn’t change anything. I used this code to show the posts, is this correct, what do I have to change, to change the number of posts that are showed?

<div id="recentnews">

		<h2>News</h2>

		<div id="border">

			<?php if (have_posts()) : ?>

				<?php while (have_posts()) : the_post(); ?>

					<div id="homepost">

						<a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>">
						<?php the_title(); ?></a><br />
						<small><?php the_time('F jS, Y') ?> <!-- by <?php the_author() ?> --></small>

						<div class="recentnewsentry">
							<?php the_content('Read more &raquo;'); ?>
						</div>

					</div>

				<?php endwhile; ?>

			<?php endif; ?>

		</div>
</div>