On the ribbon at the top right select the Gear (2a). From the dropdown menu on the right select Mail (2b). (You might have to scroll down to find Mail.)
In the menu on the left under Mail > Accounts, click on Forwarding (3).
Select Start forwarding (4a). In the Forward my email to: (4b) text box, enter the email address you want your mail forwarded to. If you want to keep a copy of your forwarded emails in your current email box, select
Keep a copy of my forwarded messages (4c). Select Save (4d). Your emails will now be forward.
To stop forwarding your mail follow steps 1-3, Skip 4. Select Stop forwarding (5). Select Save (4d). Your emails will no longer be forwarded.