How do I add “edit post” to my posts?

look at the way it is done inside the default theme:

<?php edit_post_link(__('Edit This')); ?>

and edit the theme files accordingly.

I’ve added it to page.php but it still won’t show.

You have to be logged into the admin panel.

I am.

Try to use just a normal text like:

<?php edit_post_link('edit','',''); ?>

Works well for me. Don’t forget to put it into your Loop!

My loop? Where’s the loop? My page has the following:

<?php get_header(); ?>

<!-- content ................................. -->
<div id="content">

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

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

		<h2><?php the_title(); ?></h2>

		<?php the_content(); ?>
<?php edit_post_link('edit','',''); ?>
<?php endwhile; ?>
<?php endif; ?>

</div> <!-- /content -->

<?php get_sidebar(); ?>

<?php get_footer(); ?>

I’ve added it to page.php…
Wrong! The page.php file is used by WP to display Pages not your posts. You should add the code to your theme’s index.php.

Oh, thanks. But how would I add it into the full article?

Define “full article”.
And learn about the Template_Hierarchy.

Single Post page, I think.

Follow the link… (and never post back without reading the resources offered!)