The first thing you need to do is purchase a custom domain from a DNS provider in order to use this feature.
Once you have bought your domain you will need to look under your DNS settings for the option to create a CNAME record.
Each DNS provider has a slightly different way to set up a CNAME record so here are a few tutorials:
When creating your CNAME record you will need to point it at your current MinecraftMarket subdomain. E.g "yourdomain.minecraftmarket.com".
After setting up your CNAME record at your DNS provider go to your MinecraftMarket server control panel and go to "General -> Domain" and set your CNAME to the full CNAME you have just created then click "SAVE".
It can take up to 48 hours to work so until then you can keep on using your MinecraftMarket subdomain.
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