I'm not sure how to ask this and make sense... but here goes.

How can I get the main menu to highlight a specific menu item when reading a k2 item.

For example, on the following page, I'd like to have "Services" highlighted but can figure out how to do it... I'm new to Joomla :

educanimal.com/index.php/fr/component/k2/item/148-dog-education

For this item to keep the menu Services selected when visited you will have to make sure that it belongs to the Services category which has a menu item link.
From which link can I go to this item page?