joomla: editing html of menus?

is it possible for me to edit the html of the menus on top here?

http://yoursdproperty.com/index.开发者_如何学Pythonphp?option=com_content&view=section&id=1&Itemid=27

the home, buying property, selling property, etc, want to be able to edit the html. is that possible? where would the file be?

i actually need them to take up 100% of the top and to be spaced in such a manner that when you add more menus they will just get smaller because they would always take up the entire top

Maybe this tutorial helps you: How To Edit Joomla Templates - part 1.

Or read to official documentation for editing templates.