Many will want to set up a proxy to run with CloudReady - especially in a managed Education or Business environment.
The best way to use a proxy with CloudReady is to configure it in https://admin.google.com and then Enterprise Enroll it using a Guest or hotspot network. This way, your proxy is configured without any extra typing.
If you need to connect to a proxy prior to enrollment, or you are not using Enterprise Enrollment, you can manually specify a proxy as follows:
Specify proxy immediately after setup, for all users:
Specify proxy after logging in, where you can choose to share it with other users or not: