IPSEC documentation missing information - clarification needed

[lshantz]

*Redirecting the default gateway¶

OpenVPN can also redirect the default gateway to the VPN, so all non-local traffic from a client is sent through the VPN. This is great for untrusted local networks such as wireless hotspots, as it provides protection against numerous attacks that are a risk on untrusted networks. This is configurable in the GUI using the Redirect Gateway checkbox in the OpenVPN instance configuration.*

The above is missing one key ingredient for us noobs.
WHERE is this? I can find no such checkbox. ??