doubts in QT based chat app

I have started making a desktop based very simple chat application designed with Qt and so far just made a front end of my chat application. This is going to be web based server and multiple clients application i.e. just like Google Talk and Yahoo Messenger chat application.

The real confusion is I am not sure of my approach so wanted some of your inputs on this. My chat GUI is designed in Qt and for client - server communication I am planning to use Boost Asio library.

I want to design a server which is hosted on web and make chat gui on my computer to send messages through it, but I don't know if I can do it with Boost Asio library.

I have taken a free hosting and domain name just for the sake of testing it as a server, however I am now completely clueless about how i should communicate with it using my chat GUI and configure server with BOOST.

This may sound too wide, but I just want approaches to how i should achieve my goal of communicating my QT based chat client to receive messages sent on web server. Also, is getting a free hosting and domain name enough to make it act as a web server?

PS: I am using boost asio here because i am more interested in learning about its client - server communication.

I don't want to use QT's inbuilt chat client-server model because I want to make front end of chat in Qt, but for communication on back end I want to use c++/Boost Asio