You can enable a CNAME for your status page by:
1. Create a CNAME record with your DNS provider or registrar for the subdomain you wish on your domain (for example, status) and point that at your Statusy subdomain (for example, foo.statusy.co).
2. Open the "Settings" for your status page, navigate to the CNAME option, enter the subdomain you selected in the previous step. If your domain is yourdomain.com and you want status.yourdomain.com enter status.yourdomain.com in the CNAME box under settings.
After saving your CNAME settings your CNAME should resolve properly.