How did you got SSL cert without .csr? There is name.com docs for obtaining cert and it does require .csr if you don’t use name.com hosting.

Setting up an SSL when not hosted with Name.com - name.com.
To obtain CSR you need to follow tutorial you linked - How To Install an SSL Certificate from a Commercial Certificate Authority.

Make sure you didn’t followed this steps Setting up an SSL Certificate hosted with us - name.com as this doesn’t work with any non-name.com provider.

My website is already working on another host. I want to transfer it to this host. I generated that SSL for that host. Do I need to buy another ssl now?

There is no option for reissuing it on name.com. As this is RapidSSL certificate, can I do it directly at RapidSSL website?

Never worked with name.com or RapidSSL, but you if you can manage cert from RapidSSL site, go ahead and try it.

If not, look around is there name.com support, hopefully they can help you with cert.

In case you can’t reissue it, you could be out of luck, but we’ll try to find fix. =)