I have two domains (mysite.com and mysite.net) which share the same IP address. I can see that in my host control panel. I've created a Wordpress site on mysite.com, beforehand installing Wordpress using FTP. Now I want to have the same wordpress site on mysite.net, which will have the same content in different language. How can I achieve that?
You can copy the files to the other site. Then export the database, find/replace 'mysite.com' with 'mysite.net' and import it into the database for mysite.net. Modify your wp-config.php file to refer to the new database.
Then, on mysite.net/wp-admin, go to Settings->Permalinks and save it. This will reset the rewrite rules and create a new .htaccess file (when writable).