1) Look at SFGUI.
2) You should really make an effort on your own before asking for help. Right now it looks like you read the first tutorial, didn't see an example with buttons and immediately came here without even trying to figure out how the things SFML provides could be used to make a decent button.
If you have a more specific question, we might be able to help, but as it stands this question is too close to "Can you please write my program for me?"