Menu

Hello shimei,
Could you, please, specify your question? What kind of menu do you mean? Kunena template do not create special menu. I've been visited your site, so according this page I see following menu items:
Index
Recent Topics
Search

Do you mean these items?

If you mean taking styles from one template (styles of Kunena menu) and implementing them into another template, it's kind of custom work. Well, I see you've already posted a topic in Paid Work request category, so okay, we'll consider it and let you know.

Hello shimei,
Now it's time to solve your problem. To complete tasks I hace to ask about details to get kind of Specifications:
Kelegant and Kascetic have different design, so if we take a look at Kelegant we may notice there is a dark background in headers and it's a part of entire design conception. Menus and forum categories have dark background. So, Kascetic have another "clean" conception without such approach. If to change menu style, how it should looks like? Which colors? Do you need a special "arrow" element to expand / collapse menu block? Should it be added to forum categories or it's for menu only?
Thus, here is a question about style. We need much information about it, the best way is show us an image.
Another way: we may prepare .jpg image with an example according your wishes and then if you confirm all is fine, we'll make custom changes for template.
But now we need to precise the price for a job, so price can be estimated according tasks and I kindly ask you to write more details about menu design / colors.