# Segment source

> **Pre-requisites:** To use the segment source, you need to create the segment. \
> See more: [Segments](/features/audiences/segments.md)

## Enablement

1. Go to the Flows module.
2. Drag and drop the Segments block into your flow and click on the ‘Edit’ icon.
3. Choose the segment from the segment list. 
4. Specify entrance. Available options: 

* *Once* - the audience entrance the flow only once. 
* *Repeated* - the audience entrance the flow several times. 

 5\. Specify frequency of *Repeated* entrance. Available options: 

* *Hourly* 
* *Daily*
* *Weekly*
* *Monthly*

6\. Specify re-entrancy of *Repeated* entrance. Available options: 

* *Can re-enter is checked* - Addresses are sent through the flow again if still present when the flow repeats.
* *Can re-enter is not checked* - Addresses cannot be sent more than once through the flow.

7\. Save the block.

![](/files/ZvvZrqqrVxP7j2iX7P6f)![](/files/mFSCg8hAATWJ9lFUN23d)


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