Problems with the frontpage and k2 module

I would like to display some k2 modules, like in the twn2 demo (sport news, health and technology...).

My problem is that i don´t know the position I have to give to my modules to display correctly. I´m tryng with mainbody position, but they don´t display.

Could you help me, please?

We usually use right position for this module like right_top, right_bottom

We usually use right position for this module like right_top, right_bottom

I prefer to display it in the mainbody position, how I could do it?