Open the Mail App

Click on Mail > Accounts

 

step0

     
This will open a window to manage your accounts  

step1

     
This will open a window to manage your accounts  

step 2

     
Select other Mail Account… and click Continue

Input your information and click on Sign In.

 

step3

     
Input the information

For Account Type Select POP

Click Sign In

 

DONE

 

step4