Hi Dinakaran,

If I understand, what you want to do is to use the html design/site that you have created with the DnnCMS?

If so your going to have to convert your html into a Dnn skin.

Here are some links to get you started:

http://www.dnnsoftware.com/videos look for the "Design (Skinning)" section. There a videos that will explain and help you to create a skin.

http://www.dnnsoftware.com/community-blog/cid/132000/dotnetnuke-skinning-101-part-1

Hope this helps,

Regards,

Geoff

I would start looking those videos in the library to learn how DNN works. Skins, modules, editing content etc. 

The skin is the theme or structure of the page. On the page you put modules, that contain your content. Modules can also have Containers which is like a skin, but on a module level.