Yes, you can use Universal SSL if you signed up through a partner. As of December 9, 2016 all new domains added to Cloudflare via partners have Free SSL enabled.
Please note that if your domain was added before Universal SSL was enabled you will need to delete and re-add your domain again in order for SSL to be provisioned automatically.
You can check the status of the SSL certificate on the Crypto tab in the Cloudflare dashboard. Additional information can be found in our SSL FAQ.