Attaching segments to a Contentful entry
After you've added a segment selector field to a content type, you can start attaching segments to entries that are based on the content type.
To attach segments to an entry:
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Log in to the Contentful web app. 
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In the top navigation menu, select Content. 
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Select the entry to which you want to attach segments, or select to create a new entry. The entry must be based on a content type that includes a segment selector field. 
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In the entry editor, click the segment selector field, and select a segment that you want to attach to the entry.  The selected segment shows up below the field, indicating that the segment has been attached to the entry.  
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To attach additional segments, repeat the preceding step. 
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If you want to remove a selected segment, click ✖ for the segment.  
You've attached segments to the entry. You can now display the entry only to visitors who are in the selected segments.