How to edit both menu's?

[IntoRain]

class_sidebar.php contains the contents displayed on the sidebar. To edit its css, it's inside the id #menu and it's a class .sidebar, so you can change its css in any .css file you are using (mind the order, so it can override previous styles).

Also, the sidebar and the content on the right are in a table, so making it float right won't work. If you want to change this/invert their positions in the table, edit the template.tpl file (knowing that {sidebar} represents the whole sidebar, the same applies for the other objects represented like that, you will figure it out once you open the file)