How can I display the HTML code for my WordPress?

ther is no place where the fimnal html files are stored.

the html pages are created dynamically; content is stored in the database, while the structure is build by php code within the html structure of the template files of your theme.

http://codex.wordpress.org/Theme_Development

define what you need to edit, and try to locate the template where it gets generated.

depends on te theme you are using – could be in index.php, single.php, or loop.php or….

also, depends on the definition of ‘some pages’.

please post a link to your site amd the name of your theme for more suggestions.