When I try to change author's name of article in the backend, I push "change author", then table of user open, i push the user, BUT HAPPENS NOTHING..What's wrong? How can I solve it? Thank's

Hi. I suppose that by saying "Push the user" you mean that you click on the user, right? If nothing happenes, then probably you have a javascript error in your page. I assume that you are using the latest version of K2.

Yes, it's true. I use latest version. And this problem is on all browsers...But can I solve it?..What should I do?

Ckeck your page for javascript errors. You can view them in the javascript console.