Generate discount code - Joomla - CB Subs

Hi,

I need help creating a subscription discount code for our Joomla website - https://greenalchemist.co.uk/

We use CB Subs to manage all our subscribers.

Here is documentation I found on discount codes, but a developer should be able to understand this much better than I can.
https://www.joomlapolis.com/documentation/283-cb-paid-subscriptions/tutorials/18407-purchasing-discount-coupons

The discount code is very simple - "Sign Up and get the first month free".

I'm hoping this is possible?

I always need help managing this Joomla website, so the job can easily lead to other jobs.

Do let me know if you have any questions.

Regards
Ayo