Drupal 7.x

Hello there,
I´m new to Drupal world, and I am trying to install some themes using the option in the
administrator page - "Install from a URL" and copy the link location of the theme,
but after I put the FTP details, I get this error:

File Transfer failed, reason: Cannot create directory /public_html/platinum/sites/all/themes/danland

I supposed that´s maybe about permissions, but I am not sure.
Just wanna mention that I am using a remote server of my own,
so I have complete root control.

Can someone help me on this?
Thanks

 if($page['sidebar_first']) { 

}

if i use this code it will show error
(but not on all page)
# Notice: Undefined variable: page in include() (line 12 of D:\wamp\www\gtes\sites\all\themes\framework\block.tpl.php).
how to do this

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Error
PHP extensions Disabled
Drupal requires you to enable the PHP extensions in the following list (see the system requirements page for more information):
pdo
Error
Database support Disabled
Your web server does not appear to support PDO (PHP Data Objects). Ask your hosting provider if they support the native PDO extension. See the system requirements page for more information.

how insert in my existing project for drupal?
and how modify that(existing project) for support to the new drupal theme?
my existing project constructed by (php and xhtml)..plz

what is the correct way to insert in my own psd design convert 2 drupal theme? and how that theme are insert in my drupal project....plz.