Yahoo Messenger? Please!

Hello all how are you? Ok I am curious of how you go about doing this:
If you have used yahoo messenger there is a place to put something which is "Status" and I wanted to have a program with a text box and a command button and when I press the command button it will add the text box data into the status part. But I have no freaking idea how you would find code for something about yahoo messenger? So how can I find this out? Thanks in advance guys I appreciate the help and have a good night :) Thanks
Mike

Please guys! Id really appreciate it! Thanks :)