First, make sure you've added your domain to the custom domain settings in Canny:
Setting up DNS
Next, add a CNAME record to your DNS, pointing the custom domain (feedback.yoursite.com) to "cname.canny.io".

Here are some instructions for setting CNAME records in various popular DNS services:
CloudFlare (Instructions)
If you're using CloudFlare, please make sure to disable the orange cloud for your Canny domain.GoDaddy (Instructions)
Google Domains (Instructions)
Namecheap (Instructions)
HTTPS/SSL works automatically
We support HTTPS/SSL on our side, via Let's Encrypt.
Upon receiving the first request to https://feedback.yoursite.com, we'll request an SSL certificate from Let's Encrypt. This process takes anywhere from 5 to 60 seconds, so don't be surprised if the first request doesn't work.
If you need any help, reach out on live chat and we're happy to help out!