i have installed wp but when i open a catagory or post the title remain same. but in these sites("smsrozana.com" and "sms4smile.com") the title of home page, catagory and posts are different and relative to catagory or post. but in my blog the title of home page, catagory and post remain same. please help i have installed wp at (it-pk.com/sms)
It looks like you set the general title and description Settings/General Try downloading and installing one of these plugins: http://wordpress.org/extend/plugins/all-in-one-seo-pack/ http://wordpress.org/extend/plugins/platinum-seo-pack/ and whenever you make a post or page, or edit, scroll to the bottom and enter your title and description in the proper fields.
I use the first one as it seems more popular, but the platinum one is a little more robust. But I think it left a link back to the authors site, but that may have been only on the plugin page. Use one or the other, I don't think it matters much SEO wise, but the platinum one may have a few options you might want to use, although there's plugins you can use if you use the other one.