Where Can I Add This Code In The Custom_functions.php ?

I am trying to customize my thesis wordpress theme. I want to add a adsense until link under the navigation menu, but whatever I do is keep getting "Parse error: syntax error, unexpected '}'" Could anyone kindly advise what to do? Thanks

How can i add the following code below;

to this custom_functions.php file ?

 

where are you adding it into your custom functions file? before the last } or <?php

here is a plugin to help you with hooks.
http://wordpress.org/extend/plugins/thesis-openhook/

 

you can put it anywhere you like, just make sure it is outside any other function declaration

 

copy paste whole custom_functions.php code.
i can help you fix it.