Trying to apply the configuration patch to update the shared session state to use mongo per doco below: https://doc.sitecore.net/sitecore_experience_platform/setting_up__maintaining/xdb/session_state/walkthrough_configuring_a_shared_session_state_database_using_the_mongodb_provider
However bit stuck with best way to patch it. One option is to delete the sharedSessionState node and add the mongo settings.
Any help will be good.