Website Setup Question

[prana]

Alright, here's the situation.

I have a website that Dotster is the official registrar for.

The domain servers are: NS1.MYDYNDNS.ORG & NS2.MYDYNDNS.ORG

My internet service provider is CableOne.

I'm trying to get an MX record setup.

How do I do it? Can CableOne host the MX record via the free web hosting I get with my small business internet package while leaving the domain servers the same as listed above?

Thanks in advance, I'm confused a bit and the customer service for both has been a pain in the ass so far.