Select Manage Segments under Audience in the menu. This will open the Manage Segments page where all the Segments created to date are stored. You can create a new Segment by selecting “Create Segment”.
You can view or edit any segment by clicking the crayon icon or delete it by clicking the trash can icon.
To create a new segment you can use the search criteria builder to add individual criteria and choose "AND" to find contacts that match all criteria, and "OR" to find contacts that match any of the criteria. Alternatively, if you are experienced in writing search strings, click "Edit Search Manually" to write your own search.
As you add search criteria, the summary will appear in the Search Summary box.
e.g. ~First Name [Equals] 'John'~
Between each criteria, you must select "AND" or "OR"
e.g. ~First Name [Contains] 'A'~ OR ~Last Name [Equals] 'Thomas'~
Once you have created your search criteria, click "Save" to save the segment.