There are currently two ways to build your email list with Ochre; an automated opt-in checkbox on account creation, and an embeddable html widget from your mail client.
To enable the automated request at account creation please check the "Newsletter Sign-Up" box.
To embed an html form from your mail client, please grab the html code and create a "Code" module.
And then add the code.
This could be a separate page, indexed in the top navigation, or on any custom page.