Video
Steps
1. Go to DreamHost.com.
2. Click on “Panel” next to “Customer Login” in the upper right corner.
3. Enter your login information.
4. Scroll down to “Let’s Get Started” then click on the “Website Hosting” button.
5. You should see your site in the domain list. Under your domain click on “DNS.”
6. In the name box enter “m” or whatever you’d like to use as your subdomain.
7. Select “CNAME” in the type dropdown menu.
8. Enter “mobile.dudasite.com” in the value text box.
9. Leave the comment box blank and click “Add Record Now!”