Once you have logged into your Cpanel you will need to choose the icon that says Advanced Zone Editor as shown below. 

After you have clicked the Advanced Zone Editor icon you will then need to choose CNAME from the drop down in the following screen. In the second field enter img and in your last field labelled CNAME enter img.em01.net then select the Add Record button. Cpanel will automatically fill populate your domain after you enter img. 

Once you have added that record you will need to then enter url in the second field and url.em01.net in the last field labeled CNAME and then select the Add Record button. Cpanel will automatically fill populate your domain after you enter sm. 

Once you have added that record you will need to then enter track in the second field and sm.em01.net in the last field labeled CNAME and then select the Add 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.