Hi Dan,
When creating your account to connect to the Text/HTML module, did you include an sid parameter in the posting URL? There are some videos on the product page which walk through the process of creating an account for the Text/HTML provider, but these just show the following:
When creating a WLW account for the Text/HTML provider, if you want to download the styles for the module, you'll need to pass in the moduleID for a temp Text/HTML module on a test page that is visible to the public. In DNN, you can configure this test page so that it is not visible in the menu, but visible to the general public. Once you've found the ModuleId for your Text/HTML module, you'll use a URL like the following when you create your WLW account:
http://www.yourdomain.com/metapost.ashx?key=text/html&sid=876
where 876 would be the ModuleId of the test module you've configured.
There may be another issue that you're facing if you're getting the error that says, "This feature is currently not implemented." This error occurs when trying to create a new entry. If you're getting this error during the account creation process and you've configured an sid parameter to pass in the ModuleID of your test module, then there's an issue in metaPost that we'll have to help resolve.
Many people receive this error when they try to create a new Text/HTML module using WLW. This isn't currently supported with metaPost. We'd love to add this feature, but there are too many unknowns related to creating a Text/HTML module. We wouldn't know, for example, whether the user wanted to create a new module in an existing page, and if so, which page. In some cases a user may want to have a new page created. If that's the case, we wouldn't know where to create the page. We're working to resolve these issues and are open to your suggestions, but for the time being, the metaPost Text/HTML provider will only support opening and editing exisitng text/html modules to which the account user has edit access.
Please let us know if this does not address your issue and thanks for using metaPost!
Don