I want to play customers, the page opens in a new tab . How I can add the attribute _blank to that link?

Hello, please provide a link to your site so i can help you faster

cumbucokitesurf.com.ar is the site.

I want to all the link to another web, have the atribute _blank

Hi, do you mean the customers is the same as a client? if so, you need to edit a file under theme folder > widgets > fp-clients.php then change this line:
<a href="<?php echo esc_url($link); ?>"><?php the_post_thumbnail(); ?></a>
<a href="<?php echo esc_url($link); ?>" target="_blank"><?php the_post_thumbnail(); ?></a>

Note that you should create child theme since changes will be lost on next theme update. If you decide to use child theme search forum for unregister_widget.

Yes, I meant that. Thanks for the help , had been trying to change the CSS side.