If you are using gmail, then the user name is your gmail email address. Password is whatever you create for password there. All of this is independent of outlook.
If you are using Outlook with another provider, then those settings in Outlook are what is needed to be put in Stokerlog. The exception is if you are using outlook to sync with your company email system in which case, that method would NOT work with stokerlog and you need to create a gmail account per above.