Swap from free subdomain to my domain

Just need a quick guideline how do i add my domain in IF’s system? when i go yo domain setting it only has the option to delete my free subdomain

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I feel blind, somehow the instructions seem oudated.

How to add your own domain to your account Domains and DNS

While a free subdomain is a great way to get started, a website looks a lot more professional with a custom domain name. Fortunately, you can register your own domain name with an external company (like Spaceship) and use it on InfinityFree. Adding your domain name to your hosting account To add your domain name to your hosting account, you first need to have a hosting account. Even if you only want to host your own domain with us, you’ll first need to create a hosting account with a subdomain,…