Customizing plugin for custom form

Hi – My website is: https://www.pearsonkoutcherlaw.com and contains two custom contact forms that receive a lot of spam.
I have been trying to follow these directions:

I have placed this

<?php
if( function_exists( 'cptch_display_captcha_custom' ) ) { echo
""<input type='hidden' name='cntctfrm_contact_action' value='true'
/>""; echo cptch_display_captcha_custom(); } ?>

right before my submit button, but it does not work.

Also, I do not understand where to put,

<?php if( function_exists(
'cptch_check_custom_form' ) && cptch_check_custom_form() !==
true ) echo ""Please complete the CAPTCHA."" ?>

I have done a lot of research and come up with no answers. Can someone please help me?

Thanks ??

https://www.ads-software.com/plugins/captcha/