POST to a website

Is there a way through which we can send some data using POST to a website?

Here you got engine API for HTTP
Alternativly you could use some external libery

Yup, we have used FHttpModule to send some GET requests successfully, but sending a POST request should be quite similar.

Hint: Look for FHttpModule in the UE4 source and you’ll see some real examples while they add some more documentation ;).