Asking yourself why you need to do this? Read why
Once you have logged into your Cpanel you will need to choose the icon that says Zone Editor as shown below.
After you have clicked the Zone Editor icon you will then need to choose +CNAME from the menu on the following screen.
Once you click this a popup will be displayed as shown below. In the first field enter img and in your last field enter img.em01.net then select the Add a CNAME Record button. Cpanel will automatically fill populate your domain after you enter img.
You will need to repeat this step again however this time in the first field enter url and in your last field enter url.em01.net then select the Add a CNAME Record button. Cpanel will automatically fill populate your domain after you enter url.
You will need to repeat this step again however this time in the first field enter sm and in your last field enter sm.em01.net then select the Add a CNAME Record button. Cpanel will automatically fill populate your domain after you enter sm.
Once you are done with this you can now login to your Emercury panel and Add your URLs to URL Manager.
Thats it! You're done. That wasn't so hard was it? Let us know if you have any questions. Please note that you will need to wait 24 hours before you can use these newly generated CNAME records.