How to Generate a Wildcard SSL CSR on cyberpanel

How to generate a Wildcard SSL CSR on cyberpanel?
I found onluy this answer: SSH to your server, use this command:
openssl req -new -newkey rsa:2048 -nodes -keyout mydomain.key -out mydomain.csr


I found how to create csr but i do not understand how to get it. Any help would be appreciated.

check this