The Campaign Monitor module provides snippets to generate subscribe, unsubscribe and update forms from a Campaign Monitor list.
After the module has been uploaded and installed it needs to be linked to your Campaign Monitor account via your API key. To do this within the site manager go to Settings and then Campaign Monitor and enter your Campaign Monitor API key in the space provided.
Note: Your API key can be found within the Campaign Monitor administrative interface under Client Settings, Edit, Show client API Info.
Using the Campaign Monitor module is as simple as placing the subscribe snippet on a document or within in a template where you wish the mailing list signup form to appear. The only the listId parameter is required and specifies which of your mailing lists the user will be subscribed to on completion of the form.