You can add endpoint in 4 steps: 

Step 1 - Click on "RTB - Feed" in left menu-bar
Step 2 - Click on "+Create"
Step 3 - type specific name in "Name" filed and paste endpoint URL (don't forget to use http:// or https://) to "Endpoint" field
Step 4 - Push "Create" button

Your endpoint created and pending for moderation.

You can find your endpoints in "Feeds" -> "List" to manage your endpoints.

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