How to add .htaccess file for my wordpress websites?

Hi Everyone !! How to add .htaccess file for my wordpress websites? i have ,htaccess file.. i want to upload on my wordpress website so please suggest me steps for uploading Thanks..

I think that Wordpress already may include file ".htaccess" it is in the root folder of the wordpress script, same folder where wp-config.php is. If it is already there, just add lines that does not exist in it so there are no duplicates.