Any blog or webpage which you can edit the HTML, templates, or code, will allow you to support OpenID.
Read section 3.1.1. of the OpenID Authentication 1.1 spec.
It is as simple as adding two lines of HTML which point to an OpenID Identity Provider. I’m feeling so nice, I’ll even give two code examples which you will need to fix to be proper tags. eg. > and < are needed.
### The following would work for LiveJournal accounts.
<link rel=”openid.server” href=”http://www.livejournal.com/openid/server.bml” />
<link rel=”openid.delegate” href=”http://exampleuser.livejournal.com/” />
### The following would work for MyOpenID accounts.
<link rel=”openid.server” href=”http://www.myopenid.com/server” />
<link rel=”openid.delegate” href=”http://exampleuser.myopenid.com/” />
[tags]openid, delegation, livejournal, HTML, code, example[/tags]
