Custom domains let you host your tumblelog with a URL like “www.mywebsite.com”. This can be tricky to set up, and is only recommended for advanced users. Really — our staff isn’t able to support many of the issues that may crop up when setting up a domain name. So please ask a friend who’s done this before if you’re uncomfortable with any of the instructions.
小生の場合はサブドメインのIPをTumblrに向けました。
ていうかこの機能いつからあったん？
