How do I remove the bottom part from one of my pages,

You’ll need to edit your templates and comment out (//) the following tags.

<?php the_author() ?> becomes <?php // the_author() ?>
<?php the_category() ?> becomes <?php // the_category() ?>
<?php edit_post_link() ?> becomes <?php // edit_post_link() ?>

You could remove those template tags but there’s no harm with leaving them in because it makes it easier to revert later. You’ll need to make these changes on index.php and possibly other template files like single.php, archive.php and category.php.

Wont that affect all pages?

If you only want it to affect the one page, maybe you could make a special page template; comment out those template tags in the special template, use the special template for that one page, and everything else should be unaffected.

Yup it will, I missed that you were referring to a specific page. Marcy’s suggestion is a good choice. Another option is using conditional tags (codex) to customize your template for specific pages.

I find creating separate templates easier to manage than sorting through a bunch of if/else code. But more templates mean more files to maintain so it’s personal preference.