To create a new segment head to the Guests tab.
Next, go to All Guests under the Segments tab.
Add the filters you require by selecting + Add Filter. Once you have selected the filters you require select Save Segment and enter a segment name to identify it.
Once created, you'll be able to reach your new segment at any time from the left-hand side menu. You will also be able to use your segment as a Blasts audience, as well as a trigger for your Interactions.