Click on Settings in the top right corner and choose Mail from Your Outlook Settings.Now choose Forwarding in the Mail Section. Then click on Start/Enable Forwarding and provide the email address to which mail are to be forwarded. You can also choose to keep a copy of the forwarded message by clicking on that option and the save the settings. You can click on the below link to directly go to the settings if you are logged in to your email.
https://outlook.office.com/mail/options/mail/forwarding