DeathAngelDaemon on "[Plugin: Polylang] How to add swichers at the very TOP of site"

Just add the following code (for a dropdown language switcher)

<?php pll_the_languages(array('dropdown'=>1)); ?>

for example in the header.php of your theme to put it at the very TOP of your site.

And have a look at the documentation:
http://polylang.wordpress.com/documentation/documentation-for-developers/functions-reference/

There you can find other parameters to change the switcher.