How to use Webflow COVID-19 coupon code

Hey all,
My business was lucky enough to qualify for a COVID-19 coupon from Webflow, but I can’t figure out where to type that code to use it. I emailed support twice, but haven’t heard back so wanted to turn to the forum for help.

Anyone done this successfully?

Thanks in advance,

Here is my site Read-Only: LINK
(how to share your site Read-Only link)