A personal domain name is an inexpensive, internationally universal identifier which gives you more control over your space than other IDs (e.g. email address or phone number.)
On the wiki: Personal Domains.
In order to be able to sign in using your domain name, connect it to your existing identities.
You probably already have many disconnected profiles on the web. Linking between them and your domain name with the rel=me microformat ensures that it’s easy to see that you on Google/Twitter/Github/Flickr/Facebook/email are all the same person as your domain name.
On the wiki: How to set up Web Sign In.
We found the following rel=me URLs on your site:
It looks like your site is hosted on Tumblr.com Silo without a custom domain name. In order to really own your content you need to own your URLs, but don’t worry — Tumblr has an article demonstrating how to give your web presence your own domain.
Once you’ve got your own domain, check out the IndieWeb Tumblr wiki page for tips on adding indieweb functionality to your site, or exporting your data elsewhere.