SAML Configuration to Okta in Splunk Enterprise 6.3: Where do I find Attribute query URL, Username, and Password required for setup?

I am setting up SAML authentication to Okta in Splunk Enterprise 6.3. Attribute query URL, Username, and Password are required for setup. I am having trouble finding the information needed to populate these fields. Where would I find these values? I have all of the information for the General Settings section.