How can i do that images in "slide in" show bigger? I mean, how can i config the width and height of "slide in"?. I tried but with no luck (template.css, custom.css,...). How? Where?

You will have to change the grid class for this.

Open the default.php file located at /templates/matchbox/html/mod_k2_content/SlideIn

Locate <div class="column small-12 large-4
and change large-4 with large-5 or large-6.

Let me know if you need any more customisation.

Really? large-4, large-5, i change that values but the image size is the same. The position in the screen of images and texts changes, but not the size.

Also, I'm using FireBug in Mozilla, and i see the same, positions change, not size.

Yes really.

Change the grid size. I think you have not changed the image size from the module settings.

True. Thanks Krikor.

You 're welcome mate :)