MX Records

I’m in a similar situation to the person who posted a couple of days ago about getting MX records from DreamHost. I had a domain name hosted on my account here, but have since switched the entire site to another host. Because the other host is having problems with their email, I’d like to revert my MX records back to my DreamHost account. Prob is, I don’t know the MX settings to use. I’m on the Crazy Domain Insane plan, and I don’t think I have access to the zone files. Do I need to upgrade my plan for this, or is there another way to access this info?