I can't change domains so I don't know how to change domains

I bought a new domain, but I can’t change it. | Google Translate

Hey @foalwyofficiall ! If you’re trying to set the custom domain through the editor UI (i.e., here:
You’ll need to get thanked twice by other users. You can do that by helping out on the forum and helping to answer other people’s questions! It can take a while though.

You can still change domains (without being helped) through other means though! @cori explains it in this post below, and links to two walk-throughs that should help. Feel free to hit me up if you run into any complications!