I'm just getting to grips with how things run here so I may not be entirely accurate. I'll also assume your domain is set up here also.
Looking at (Which tells about outlook):
https://desk.surpasshosting.com/inde...d=150&nav=0,13
ii. Outgoing mail server (SMTP) [ mail.yourdomain.com]
I don't know if it would vary on shared hosting package though.
often a host will then use the same username and password for the SMTP as the POP or IMAP. I presume you already have E-mail set up in some form?
If you have cPanel you would probably be able to get the info in there also. I've never really used cPanel so I'm not sure where to find it, just look for something that says e-mail account.