How to add a number/caller to a call queue that I have created?

Hey, I have created a call queue on my admin portal and assigned a direct number to it. I just wanted to add all the inbound calls to this call queue. How can I do that using API’s or using admin portal? 

Said that, I just wanted to add incoming calls on my main extension to a call queue which have a direct number 838****** . What’s the way even using API’s. Besides that, how to remove the caller from the queue or how it will be removed? Need a brief description of how it’s working.

Need a quick help because our business can’t wait more.