How can I connect Apache Cassandra to NodeJS One-Click Application Images?

Looking over the docs I found this that seems to answer your question:

For connecting to cassandra using authentication, you can use the nodejs-driver authProvider option in the clientOptions object like the following:

clientOptions: {
    contactPoints: ['127.0.0.1'],
    protocolOptions: { port: 9042 },
    keyspace: 'mykeyspace',
    queryOptions: {consistency: models.consistencies.one},
    authProvider: new models.driver.auth.PlainTextAuthProvider('my_user', 'my_password')
}