If you are looking for free wp themes then first of all search for free WP themes through google (there are lots of free wp themes available). Download one you want to use it for your blog and then unzip it and upload everything under Wp-content > themes folder. Activate it through your wp admin control panel. Thats all. DON.
Already given instruction just above 1 post of you this post laxmi. Care to check it properly. http://forums.digitalpoint.com/showpost.php?p=8061641&postcount=2 If you still having any problem then let me know. I'll do that for you free and quickly. DON.
i can't find the option you are telling.i checked each and every section of website in my admin panel.not able to find wp-content/themes
IT IS NOT IN THE ADMIN AREA Go to FTP and try there. To change the theme through admin area go to DESIGN -> THEMES
Try this small tutorial who i write for you. Hope you understand it. Link Also check my wordpress theme. Maybe you like it and you use it. Best regards