Hi, in the file includes/functions.php
Search this text:
$form .= '<input type="submit" name="av_verify" id="av_verify" value="' . esc_attr( $submit_button_label ) . '" />
And put after this:
<a href="Link to leave"><input style="border: 1px solid #ccc;border-color: #ccc #ccc #bbb #ccc;border-radius: 3px;background: #e6e6e6;box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), inset 0 15px 17px rgba(255, 255, 255, 0.5), inset 0 -5px 12px rgba(0, 0, 0, 0.05);color: rgba(0, 0, 0, .8);cursor: pointer;-webkit-appearance: button;font-size: 12px;font-size: 1.2rem;line-height: 1;padding: .6em 1em .4em;text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);" value="TEXT TO SHOW »"/></a>
In a href: put your link
and in the value: put your text to show
I hope that works for them.
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