As Salam u Alaikum
You can now import and export your entire blog and comments as an XML file that WordPress.com will generate for you. You’ll find the export and import options not under “Manage” but now under “Tools” in your blog admin area. The XML format is an extended version of RSS 2.0, and it will be built into the next downloadable release of WordPress (3.2).
So go to “Tools” in your blog admin area and select “install rss”
That is the solution of your Q
Wassalam
