In Sentori, you can create Forms which allow people to signup for your emails and also update their details (name, mailing preferences, etc). Your Forms can embedded within the HTML of your website or hosted by Sentori.

In order to create a Form, go to Contacts > Forms > Create Form. Once you have provided a name for your Form, you are taken through a workflow to build, customise, and share it.

Form Workflow

Note: the Messages and Actions steps allow you to customise the form's behaviour and are both optional.