hi i use a yootheme template and i can't select it for k2 it only show "use default" and it too far now to change my template and the k2 articles that i add they show diffrent so somebody can help me how to do that how to select the yootheme template !!!

K2 templates ARE NOT the same as Joomla templates, and there is no way to assign it to K2.

K2 templates are for overrides - you can make your own 'layout' and save it as template for K2.

Some Joomla templates are designed specially for K2 and (as I suspect) they have their own styling for K2 items (never tried one, so it's only my assumption).

If your Yourtheme template doesn't support K2 (check Youtheme website), you have to add K2 styles by yourself (edit k2.css file).