How do I add contacts to a newly created segment?

You can both import and manually assign contacts.

Import contacts

We always provide an import template for a quick start.
Per CSV import 1 segment can be specified for all contacts to be imported.

Alternatively, if there are many different segments, a user-defined field can be created (via Settings).

The segment information can then be entered in this field during the import.
The segments can then be created using the filters.

Assign contacts manually

1. Find the person(s) under Contacts
2. Activate the checkbox in front of the contact name (see picture)
   
3. Open the actions above the image
4. Select “Change segment”