Just follow this guide https://forum.ucoz.com/forum/38-21006-1#119935
Remember uCoz SSL is only for paid plans
If you don't have a own domain you can use the SSL of uCoz for free (included on your paid plan)
If you have an own domain just follow the guide: https://forum.ucoz.com/forum/38-21006-1#119935
I done add SSL Cloudflare.. for costum domain on ucoz. but I cant use anymore SSL Cloudflare
fadly168, you need to issue the certificate, thus, you need a custom domain.
why I cant use cloudflare SSL any more.. Lol... I have use SSl cloudflare but last month I cant use SSL Cloudflare again.. he redirect to http again....