To auto-forward emails in Office 365 you must first log into your online office 365 account, if you are unsure of the browser link you can click here:
https://www.office.com/
Once logged in your welcome page should look something like the below, If correct you can simply left click the "Outlook" tab on the left hand side panel, if you are unable to see this you will need to left click the 9 dot ellipsis in a square in the top left hand corner, then "Outlook" should show in the lest of apps.
Once you have selected outlook your screen should look similar to the below:
At the top of the page, select Settings by left clicking the cog, then
Select Email > Forwarding
Select Enable forwarding, enter the forwarding email address, and select Save.
Email forwarding has now been enabled.
Public Knowledge base articles for customers to assist with managing their internet, email and IT cloud based services.