In order to contribute to Gerrit a Contributor License Agreement must be completed before contributions are accepted. To view and accept the agreements do the following:

  1. Click 'Sign In' at the top right corner of https://gerrit-review.googlesource.com/

  2. Sign In with your Google account

  3. After signing in, go to the Agreements tab on the settings page

  4. Click on 'New Contributor Agreement' and follow the instructions

For reference, the actual agreements are linked below:

Part of Gerrit Code Review