The HTML module only accepts HTML content, not any sort of server-side script (with the exception of specific tokens, if you've turned that feature on).

Hope that helps,

There is not a way that you can see those from within the website itself, you would need to create your own module to be able to see those values.

If you're using DNN 5.2 or higher, they're made it easy to create your own module which consists of just one control file (which should be all that you need) from within the website.  In the Module Definitions tab under the Host menu, choose Create New Module from the action menu (probably a drop down in the top left of the module, or a link at the bottom).  You can then say that you want to create a new module, give it a name, and it'll let you view it and, on a local website, edit it directly through the site.

Otherwise you will need to create a control and upload it to the site as a module.

Hope that helps,