Change Position

Hello, what file of flarum I must edit to change this:
http://prntscr.com/kvtjgt
To This:
http://prntscr.com/kvtjit

If someone click to his profile, the flarum redirect him to posts, I want to change this too.
I want to redirect him to Discussions.

Thanks ?

Try that for a pure CSS solution:

 .item-posts {
    position: relative;
    top: 3.5em;
}
 .item-discussions {
    position: relative;
    top: -3.5em;
}

You may have to adjust the value of top to suit your layout.

Kryonoglou

If someone click to his profile, the flarum redirect him to posts, I want to change this too.
I want to redirect him to Discussions.

This can't be done with CSS alone, this would need an extension.

I can't understand what.. Because all of those settings are in files. Why I need extension? I just want to change the link from the correct file.. :/

It's not advisable to change core files. While you can certainly do that, it will cause problems in the long run when it comes to updates.