Pop3 Setup - Domain Hosted Elsewhere

I have my domain hosted with topproducer - a template style realtor webhost - but they don’t offer an email address. I kept email for my domain on the dreamhost server and changed the mx records at topproducer. I’m receiving my email but I have to access my mailbox at the webmail address of another site that is fully hosted by dreamhost. (sorry if I’m not making this clear)

How should I set up my pop3 client to access my email if mail.yourdomain.com is not being hosted by dreamhost?

Let me know if you need anymore info.