How to add a port to cyberpanel via SSH

Hello guys, I followed a tutorial on YouTube which explained how to access cyberpanel wit an ssl certified domain name instead of using cyberpanel ip address. The tutorial was straight forward and I was able to access cyberpanel with domain name. The tutorial goes on to delete port 8090 since it was no longer needed to enter cyberpanel. Since I am not too technical, I think I should have stopped there but I continued to delete the port 8090 as showing in the YouTube tutorial and after that, I cannot access cyberpanel no more! All I am getting now is 503 Service Unavailable! It seem like I need to add port 8090 back but how to do this? Anybody got a suggestion? Please help! Thanks ahead!