There are three ways to remove the Powered by Neve in the Neve Wordpress theme. The easiest is as follows:

1 - Support the developer and buy the theme.

2 - Don't use the bottom most footer (footer 2), instead place your footer items on the upper footer. Then simply add this CSS in Customize > Additional CSS:

/* Remove Copyright */
.footer-bottom-inner {
display: none;}
/* End Remove Copyright */

A plus of this method is that it survives theme updates, and doesn't need to be reapplied.

3 - Here's how to remove the footer item via code, which you'll have to do on every theme update. This will allow you to use all footers.

Open the Wordpress Theme Editor, in WP Admin > Appearance > Theme File Editor 

Edit the file /header-footer-grid/Core/Builder/Footer.php

Look for these lines (133 in current theme) and remove the lines in RED below.

$output = '<div class="builder-item"><div class="item--inner"><div class="component-wrap"><div>';
$output .= sprintf(

/* translators: %1$s is Theme Name ( Neve ), %2$s is WordPress */
      esc_html__( '%1$s | Powered by %2$s', 'neve' ),
      wp_kses_post( '<p><a href="https://themeisle.com/themes/neve/" rel="nofollow">Neve</a>' ),
      wp_kses_post( '<a href="http://wordpress.org" rel="nofollow">WordPress</a></p>' )
);
$output .= '</div></div></div></div>';

Once modified the revised code will look like this:

$output = '<div class="builder-item"><div class="item--inner"><div class="component-wrap"><div>';
$output .= '</div></div></div></div>';