Hi,
This is pretty simple fix. Enable HTML editor in your site and you will be able to use HTML on your pages. I can help you to install it.
My bio: I'm a Drupal themer/developer, I have over 6 years working on various Drupal projects from (Design, HTML, CSS, Javascript) to development (PHP, MYSQL, Drupal). I can create new themes, fix theme issues and module issues, create and upgrade Drupal sites, also suggest the best solution for Drupal site owners.
Thanks,
Dang