At the wordpres extended upgrade instructions page here : http://codex.wordpress.org/Upgrading_WordPress_Extended
It says this : .htaccess file--if you have added custom rules to your .htaccess, do not delete it;
# robots.txt file--if your blog lives in the root of your site (ie. the blog is the site) and you have created such a file, do not delete it.
Where do i find .htaccess, robots.txt and index.php files ? iam using Filezilla. Iam hosting on http://www.free10gb.com
On the wordpress.org Blog, they aslo say this : modify your theme to add tag support.
SO, WHERE DO I FIND THE THREE ABOVE FILES, AND HOW DO I MODIFY MY THEME TO ADD TAG SUPPORT ?
PS. I DONT KNOW A BIT OF PROGRAMMING .CODING
PLEASE SOMEONE HELP ME !!!