Hi Peter! Carol at Trulia here. You can link your Active Rain Blog to your Trulia Profile if you have a specific URL for it, you can just put it in as another website. Go to your Profile page, click on Edit Profile and select the link [+] Add another Web site which is located right under your current website.
Or, if you want to include it in blog posts, you can insert a link for it on each blog post you have on Trulia.
If you have additional questions, please contact us at http://www.trulia.com/help/ask/
or call Customer Service at 1-888-466-3501.