First go to your gmail inbox go to settings(near email id on top) > Fowarding and POP3 and configure it.
Now enter the information in MP!L.
Edit: Make sure you enable it and use this info.
Incoming Mail (POP3) Server - requires SSL: pop.gmail.com
Use SSL: Yes
Port: 995
Outgoing Mail (SMTP) Server - requires TLS: smtp.gmail.com (use authentication)
Use Authentication: Yes
Use STARTTLS: Yes (some clients call this SSL)
Port: 465 or 587
Account Name: your Gmail username (including '@gmail.com')
Email Address: your full Gmail email address (username@gmail.com)
Password: your Gmail password
I already had posted in another thread about an hour back.