Choose "Add a new mail account”. Click "Next".

Choose: "Pop3" and click "Next".
 

Fill in: 
Your name - Write in the name that you want to be shown on the screen when recipients receive e-mail from you. Most choose to use their full name, but he choice is yours. Click Next when this is done.
E-mail Address – Write in your e-mail address 
User Name –Your email address for example name@domain.com 
Password – The one set up in the control panel when you set up the mail address. 
Type  in Incoming and Outgoing Mail Servers and click Next.
Important concerning SMTP (Outgoing mail server)
Multiple internet-suppliers have closed port 25 in their network settings, so that customers that have internet access through these suppliers can only use their SMTP-server (outgoing mail server).
Try to send a test e-mail. If it fails to be received then you must change to the SMTP-server that your internet-supply uses.
Click here for a list of internet suppliers with their information and servers.

If you are using Active 24’s outgoing mail server then you must click "More Settings" and tick: "My outgoing server (SMTP) requires authentication".

After choose "Use same settings as incoming mail server".
Click OK

Click "Finish"