hello,
how to hide one or two of k2 quick icons in left of panel(e.x :k2 documention,comments,tags,Extend k2).I attached img to show exactually what i mean ,but it is not attached , i do not know why .

Hi. K2 quickicons is a module. You can always override the module output as you would do with front-end modules. You can even disable it if you don't need it.