This article explains how to automatically forward Gmail to another email address using the web version of Gmail. It also includes information on how to disable Gmail forwarding.

When you use filters to forward your email messages, you can forward only messages that meet certain criteria to external addresses. If you prefer to read your email in another app or web interface, forward all Gmail messages you receive to an email address of your choice.

Select the gear icon in the top-right corner of the Gmail screen.

Select 'Show all settings' from the drop-down menu that appears.