You have to go to the server into your joomla directory and open modules\mod_hot_joomla_carousel_pro\mod_hot_joomla_carousel_pro.php
around line 270 you will see;
$output .= '<a class="readon" href="'.$link.$customItemIDHTML.'">'.JText::sprintf('Read more...').'</a>';
so you could just cahnge Read more... to your text, or change Read more... to something like
CPRO_READ_MORE
then in
language\en-GB\en-GB.mod_hot_joomla_carousel_pro.ini
add translation:
CPRO_READ_MORE="your text"
second solution is better for multilingual site
