I am not 100% sure I follow what you are trying to do here.  "When you say when you try to edit or add an item" What are you referring to?  Can you provide more details...

Thanks

Hello chrisg,

My problem is when I'm login in front end instead of having the K2 editor I have two K2 editor at the same time and none is working.

Check the picture

Thanks,

Nuno Francisco

change line 62 in the modal.css file. media/system/css/modal.css

.sbox-content-image#sbox-content {
overflow: visible;
}

to

.sbox-content-image#sbox-content {
overflow: hidden;
}