Google Recaptcha Installation

I am trying to install the addon for Google "I'm not a robot" recaptcha 
The instructions say 

" **On line ~5, insert your secret key**

  'secret' => '0000000000000000000000000000000000000000' "

Line 5 in func_captcha inc.php reads 

"if (!isset(session::$data['captcha'][$id]['expires']) || session"

Can someone tell me where to insert "secret key"

thanks
tim
Replace the zeroes with your reCaptcha secret key
What's not clear is do I simply replace the entire line 5 with the secret key or insert the key within the code somewhere? 

That's what I'm not clear about...if i have too insert in inside the code I don't know where to.

If I simply have to replace the line 5, the addon instructions should make that clear as in 

Replace line five with  " 'secret' => '0000000000000000000000000000000000000000' "

Thank you for getting back so quickly.
tim
Replace the zeroes with your reCaptcha secret key.

Meaning, not the single quotes, spaces or anything else. Just the "zeroes" characters.
This is a zero character --> 0

Example:

'secret' => '1234567890123456789012345678901234567890'
So I did make some silly mistakes...but I think I have it right now...but it doesn't seem to be working.
Attached (bogus keys) is the script i used in recaptcha_inc.php
tim
I have updated the vqmod for LiteCart 2.x. Assuming you are not running Litecart 1.3.6 for which the vqmod was compatible with.
Am running 2.1.1 Under php 7.2

Should I redownload updated Recaptcha or just vqmod? And is there a link to the updated vqmod?
Yes...I have and have downloaded it.
Will try later

Thank you Tim.
Do you offer install services for recaptcha and SEO or can you recommend someone who does?
Thanks
tim
I do offer paid assistance. Is there a reason why you need Google Recaptcha? Otherwise this might be an unnecessary cost for you.
I like the simplicity of the recapture....am sure visitors would also...
I will take you up when am ready....at least I will know who t go to when ready
thanks......... elias