You need to start the method by selecting the “Outlook ” file menu. At the top right corner, you will find the option “Add Account” simply click on it.After pressing on the “Add Account” you have to choose the option “Manual Server Settings” for manual setting.

https://www.roadrunneremailsupports.com/how-to-set-up-the-email-address-of-roadrunner-webmail-to-ms-outlook/