Create Unlimited Free Subdomain

I have problem with my website Cannot Create Unlimited Free Subdomain like : .rf.gd, and .epizy.com
anyone help me please !!! Website Domain propagation very long time, website not up
can i order premium account to create unlimited free subdomain only and host to other vps ?

You can create unlimited free subdomains here as far as I know. What is preventing you from adding more subdomains to your account in the Subdomains section?