How to create a subdomain?

I tried creating subdomain by going to, then selecting the subdomain tab, but once I put the name and press save, I get blank page and nothing happens.
Am I doing something wrong or the subdomain interface is not working?

It’s working for me

Thanks, Amxx! I guess the problem is only with me. I tried Opera mobile and Trust Wallet only, but will see if I can make it work with another browser. Thanks again

I did it on chrome & firefox (with metamask)

Thanks, Amxx! It seems like it computer issue with me. Firefox and Chrome Both work fine for me now.