The out of the box functionality does not support adding comments. You have a post that is just added to a list. You need a custom control where you get the post ID and save a comment directly to it. You have to create a custom persistence classes ( you can use Telerik Open Access or LINQ- SQL) to save the comment and post ID, so you can get/set the value on load/save.
There is a method .GetPosts(ID, sortOrder, visible); which you can use to get all posts for the thread. You can get the thread ID from the QueryString. Then for each post you can get the ID and save it to the custom database table.
All the best,
the Telerik team
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