to change template click installer -> Templates – site in your joomla site and you can choose to upload the template, but you will have the following error though.
here is the error
Upload failed as /media directory is not writable.
that error happen because you didn’t change the folder permission to 707. So here’s how.
change all this folder permission in your Joomla directory to 707 by using chmod
and also change
configuration.php to 666
*.php to 644
and other files to 755