Help me please

Just downloaded wordpress and was trying to set everything up and I was attempting to change the wordpress url thinking it would be easy since I was following step by step instructions. Turns out I have no idea what i am supposed to do and I can’t go back in and change the url. Was following http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory and got stuck after step 5 and don’t know what to do. Can someone please explain to me what to do, in simple english. I am not great with computers, so as simple as possible (i.e. what file to open, where it is, what to do) thank you for any help, or if you can get me back to previous wordpress url that would be even better. Here are the steps left i need to complete. I am using 000webhost if that is helpful

6. Move your WordPress core files to the new location (WordPress address).
7. Copy (NOT MOVE!) the index.php and .htaccess files from the WordPress directory into the root directory of your site (Blog address). The .htaccess file is invisible, so you may have to set your FTP client to show hidden files. If you are not using pretty permalinks, then you may not have a .htaccess file. If you are running WordPress on a Windows (IIS) server and are using pretty permalinks, you’ll have a web.config rather than a .htaccess file in your WordPress directory. As stated above, copy (don’t move) the index.php file to your root directory, but MOVE (DON’T COPY) the web.config file to your root directory.

8.Open your root directory’s index.php file in a text editor

9. Change the following and save the file. Change the line that says:
require(‘./wp-blog-header.php’);
to the following, using your directory name for the WordPress core files:
require(‘./wordpress/wp-blog-header.php’);

10. Login to the new location. It might now be http://example.com/wordpress/wp-admin/

11. If you have set up Permalinks, go to the Permalinks panel and update your Permalink structure. WordPress will automatically update your .htaccess file if it has the appropriate file permissions. If WordPress can’t write to your .htaccess file, it will display the new rewrite rules to you, which you should manually copy into your .htaccess file (in the same directory as the main index.php file.)