Hi @Ramya D?,
If you're referring to the REST API connector, you can learn how to use the connector to pull data from API endpoints by watching this video: https://www.youtube.com/watch?v=HZMAJEj_N0k
When you look at the connections screen in Trifacta, if you don't see "REST API" listed, you may need to reach out to your Trifacta contact and request that this functionality be enabled.