Wherever you create and add your ambassadors to segments, you want to be able to see them. You can view your segments by going to the 'users' tab on the left panel. Click the 'filter' icon on the left of the page, scroll down and you will be able to see your 'saved segments' on the left.

To view ambassadors in a segment, select the check box and click the 'Apply' button. It's that simple :)

See how here:

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