How to configure push rules

For the Eclipse ESCET project, we would like to establish some 'Push Rules'. See https://docs.gitlab.com/ee/push_rules/push_rules.html.

E.g. we want all commit messages to start with the issue number (e.g. '#1 (closed) Some commit'). Using a push rule we can enforce this, in case we forget. I think we'll have use for other push rules as well, e.g. for branch names.

How can we configure this? We don't seem to have any access to project settings.